A good concept for a game, wish there was some audio to go along with it. The only problem I really had with the gameplay itself was the control scheme. It's difficult to both walk, rotate, and shoot all with one hand, would have rather seen the mouse be used as a rotate, although maybe that's part of what's supposed to make it difficult.
I'm also not sure the game adheres strictly to the resolution restriction. While it seems like the main game is appropriately sized, the menu definitely has nice rounded buttons that are much higher than 64x64 resolution.