I had fun trying, but failing miserably at playing the game because I did not read the description xD
I don't think it's possible to go past a level as a single player. It has a lot of potential for a co-op game, but maybe not so much with a keyboard. I feel it would be awesome with controllers.
A single-player mode can possibly work. It would need enemies to be a 1 hit kill though, and don't have so many right from the start. It needs some background music too, but overall it's a great concept!