"XP Slime has no way to lose. Even when you can't move forward you can still go back."
I disagree :)
Actual feedback time: I liked the idea, but I wish the -1 level was less annoying/waiting. It just wastes time for no reason. Control scheme is simple enough and works, just don't spam it like an idiot unless you want to get stuck in a wall and "lose" the game.
as for the music, I am sorry to say but I didn't enjoy it.