OK, thanks!
You made me spend basically half the day with this game playing …
Guess I'm hooked … for now.
So I have a lot to say now.
First of all, congrats on the 1.0.0 release! I remember test versions of this game from years ago.
Boy, this game is
hard.
After you complete the tutorial, the game almost instantly jumps into hard mode.
Completing any other levels takes me much, much longer. I guess I will be busy with this game for a while …
So, the idea of the game is interesting. Controlling the ball is really tricky and hard, it takes a long time to fully grasp how the ball truly works, even beyond the tutorial IMO. And to actually master the ball movement takes even longer. The control scheme alone makes the game quite unique, I guess. I'm not sure if I ever saw a ball game with such a tricky control …
The gameplay is as simple as it can get: Just touch all the orbs. The tricky part is with figuring out how to control your ball and how to interact with your environment. There are no extras, no collectibles but the game doesn't need them. It's a strong focus on physics.
About the levels … The difficulty raises very sharply. It goes from easy-peasy tutorials to EVIL MODE in an instant. The only easy non-tutorial levels are Hills, Skate Park I and Skate Park II. I consider everything else to be hard to super hard. Heck, I even found the Caves level to be tricky as the orbs are placed in some annoying positions.
Don't get me wrong, I don't think the hard levels are bad (in fact, you should absolutely keep them!), but for future versions I'd suggest to add some easy to intermediate levels so you can get used to the weird ball controls. It's not good when the difficulty raises all of a sudden.
It seems in the Caves level there is a nasty point of no return. At the end, there is this giant cave and it seems there is no way to return … it goes downhill very sharply. So if you have entered it, but missed a few orbs behind you, you must restart the level. It took me a long time until I realized I had to restart. Or I have completely overlooked a secret path … Idk. I think the hardest part in Caves is with me being confused where up and down is … Haha. Everything is dark and the walls are basically a big tube, and sometimes I really had trouble in figuring out where gravity will pull me to. But an interesting level nonetheless. Maybe disorientation was also totally intentional in this level … If that's the case: Good job!
The current level in the Caves category I'm on is Boulders (the 3rd) one. I mean, I totally get what I must do there, but I am too stupid to do it. But I am getting better … slowly. I will beat it eventually. My current record is 2 orbs.
I really liked the Sinkhole level, rolling in circles is fun! Also really makes you think in which order you hit the orbs because you don't want to get them near the hole … I believe this might even be my favourite level.
I haven't managed to beat Trees yet. It's way too easy to fall off.
The skate park levels I, II and III are cool, and the third one demands some crazy tricks. But with some thinking, it's doable. It took me like 30min or more. Spake Park IV I don't understand (yet). I'll think about it later. There's also a graphical glitch when you fall outside this level (just go left or right). Everything looks so flat and unreal and some surfaces just disappear when viewed from the other side …
The Tutorial is well made. Its good it teaches various tricks, they are really important for the levels. The only level that confused me for a while was the lava level (“Long Jump”). After only 75 deaths, I made it. XD The trick you have to do here is neither easy nor obvious. It's not enough to follow the on-screen instructions, you apparently also have to hit the keys at the perfect moment. Maybe this level should be completely redone. Maybe it's easier to understand if it goes in the forwards direction.
I found the secret level! And believe it or not, it “only” took me >150min to complete it! I swear, if my computer or the game would have crashed, I would have gone berserk.
This makes me wish the game would save the current level state when I quit so I can resume later. Anyway, cool level design and I totally understand why it's a secret.
And boy, this level is huuuuuge! No wonder it took me so long. But the most time I spent figuring out what I am supposed to do.
The most annoying part was the toilet. First, it took me ages to figure out what I am supposed to do here. Then I figured I could use the toilet as ramp, but even after a billion attempts I fail here like 19 out of 20 times, but I am getting better here. I have not found a reliable way to climb up. I just try and try again, hoping to succeed. Eventually I did.
In my 2nd playthrough, I looked for secrets and I found one secret pizza piece at the window!
But something odd happened when I jumped on the television. The game teleported me to a Drug level?! WTF? And it seems there is no way to return. I speeded on this for like 10 minutes but nothing happened. Also no orbs anywhere. Not fair as it forced me to restart the level and lose all progress. 
Thankfully, this didn't happen in 1st playthrough. Maybe something happens when I touch the surface of those pillars, but I am too dumb for that. Is this supposed to happen?
Finally, I suggest to make the secret level accessible through level category menus as soon you found it. Having to wait ca. 20 seconds every time gets annoying fast. Plus, this would expose the level records.The controls with gamepad are not good. I figured out the camera is much easier to control with mouse. The controls with keyboard and mouse is good. It works.
Btw, I noticed in the README there's a shortcut for flipping the mouse axis and some other tweaks. It would be good if the game would write some short message if one of the function keys is pressed. It's possible to hit those keys by accident and it is probably confusing when the mouse axis suddenly flips for no apparent reason.
I would recommend to players to stick to keyboard and mouse for now. The problem with the gamepad is that the camera control is too hard to control and also too slow. A precise and fast camera control is, however, very important for many levels. The gamepad moves the mouse (which is nice), but it's too slow on large resolutions (like 1920×1080). It takes ages for the mouse to move between buttons. Maybe increase the gamepad mouse speed on larger resolutions?
Plus, the camera movement with gamepad is on the wrong axes for my gamepad. My gamepad has 2 thumbsticks and the X axis of the first thumbstick moves the camera vertically and the Y axis of the 2nd thumbstick moves it horizontally … That's sub-optimal.
Flipping the axes does not help either, it won't fix the weird mapping.
Note that each gamepad uses its axes differently, you cannot predict which axis is X and which axis is Y, or if it is even a thumbstick at all. Hardcoding the axes into the game will only work with your own gamepad and a few lucky players who happen to have a similar gamepad. Therefore, I wish that the gamepad controls were configurable.
The sound effects are rather boring. Given the idea of irrlichts and orbs, the game would be much better if there is more atmospheric noise or a nice atmospheric background music, but there almost none. Some levels really are made for some background atmosphere: Volcanic atmosphere, cave atmosphere, space atmosphere, etc. The whole game is basically made out 3 sound effects: Your ball moves/rotates, and the orb hums or gets hit. Yes, there are other sounds, but they are less common. Needless to say, this is getting very repetitive.
What's worse, replays don't have any sound at all. This makes them boring to watch. I don't understand why you disabled sound in replays. It doesn't make sense. I have never seen a game which does this! Until today.
The graphics are rather poor. Everything is very simplistic and the textures are just meh and very repetitive. For dark levels the simplicity is acceptable but not for the bright levels like Skate Park III. The lava texture is especially bad, it's not even animated and looks very blurry and low-res.
The GUI is minimalist and does its job fine. It's like how game GUIs should be. The buttons and texts are large enough to be readable. I am mostly happy with it and wouldn't change much. The only minor thing I'd suggest is to add some check mark or another icon for completed levels/levelsets.
Also, I agree with the previous posters that the README should say what this game is about. That's the point of a README.
So, PLEASE describe the game properly in the README. Also in the first forum post. I doubt many people actually care about a changelog when you never posted a previous version here. Maybe also add a screenshot or two.
This increases your chances of your game being taken serious. <3
Anyway, overall it's a nice little game with unique gameplay. The game would benefit a lot from improved graphics and sounds, about the general “atmosphere” of the game. To make the game appeal to a larger audience, more easy-medium non-tutorial levels would be an improvement. But the current amount of levels is healthy, considering it takes a serious amount of time to proceed in the game. I am not going to run out of content anytime soon.
. Although it's nice to have an "easy" level following it, right? I think it's important to have plateaus in the difficulty curve to keep you motivated.