Takes a simple mechanics and shines through clever level design. Really well tuned-- a lot of the jumps you can only just barely make, very satisfying.
Visuals and dynamic lighting were awesome as well.
Falling in the game made my stomach drop a bit, so well done!
My only thought was that using Left and Right to turn felt unintuitive (I'm used to those being used for strafing in FPSs). Perhaps this was done intentionally for people trying the game without a mouse, though.