Hi,
The generator has a feel that I really like in my games. Dark greyscale environments (limbo-esque) work so well, especially when the setting is a mine! It didn't even bother me one bit that the character was just a black brick or that the walls were pointy planes - it worked well together and I enjoyed playing my way through to the end!
I did however miss sounds. Without them, some of your traps (rolling balls, stomping bricks, become more trial and error than anticipating when something would happen and feeling like you played it well. The final image of the generator did also look slightly out of place compared to the rest of the game.