Interesting game.
Game breaking bug: sometimes "character" gets pushed outside of game plane (to the left or to the right) and after that keeps falling down until page reload.
Thanks, Bogudan.
This bug is strange, it’s the first time I hear about. But I think it can happen if the character is too fast (but really too fast), then walls cannot process the collision. Thanks for reporting, I think I can solve placing a force outside the screen pushing him to center of the screen. Sorry for the problem.