I think you should change the appearance of the objects on the roofs, because at the moment too many times the jumps are actually impossible because you have a box too close to the edge and you don't have the time to jump (not even if you manage to walk over it doing a small jump), or even worse, you land on a roof and miserably crash into a box which is right in front of your nose and you don't have the time to jump again.
sometimes I died just after spawning because I landed on a box.. -_-
make the roof longer, and set a rule which doesn't spawns objects too close to the roof edges.
then the game is pretty well made with cool graphics and good animations. the problem is that at the moment is barely playable..