So...It's ready now and just for the time of a new release!
youtu.be/UUcdtxoO5Lw
I had that timelapse of level editor but it didn't fit in as MCMic suggested. It was just too fast and broke the "flow".
And thanks everyone of the valuable feedback and ideas which you gave me. This wouldn't be possible without you! 
So, what do you think of the result?
