There are are many places where you cannot go back, which also makes the first bonus almost impossible to get. Personally this should DEFINITELY be in the guidelines, but others seem to disagree.
I don't really like the checkpoints being on the floor. (I guess this is just being picky).
I keep thinking that I am about to die, then end up going on a different route. I of course can't go back on this sometimes.
I might be being a bit harsh, but I just don't like the style of it in general.