Great atmosphere! Music, sound effects and death screen make for a wacky but coherent whole.
It's also nice to restart only the current level and not the whole game when you lose.
Mostly bug free, apart from a small bug on the third level, when you hide in a box you go through a wall.
Special mention for the dynamic minimap, simple and functional implementation. It reinforces the “tactical” aspect of the game, and limits random deaths at every turning of a corridor.