A great game but some issues need to be fixed:
The player goes behind the walls when jumping, The spikes doesn't kill the player (I don't know if that's how the game is supposed to work) And a particular cube launches the player up in the sky(I don't know if that is supposed to happen or it is an intentionally placed bug. Some form of checkpoints would have been nice. It's not nice respawning at the start every time I die.
A great game overall.