Tileset use: Poor. No background eyecandy (all used for walls), half the basic blocks are used wrong, and the author couldn’t figure out the ramps.
Difficulty: Well, I’ll admit I died. That was because I fell into a pit that it took me forever to get out of (though it Is possible) and had spikes at the bottom. Other then that, the author tried to make it hard by inserting lots of enemies everywhere.
Gameplay: Not too good. You have to keep scanning the floor for collapse scenery.
Design: Decent.
Extremely difficult? Not really.