That was nice. I like the overall concept, and the controls were pretty smooth. The game feels very fast paced and frantic, and I think that feeling fits perfectly with the game's theme. My only real gripe would be 1. The tutorial is really slow, and yet is required to know how to play the game (here's an idea, maybe place an image showing the controls as part of the game environment, like, have some writing on the wall which shows how to shoot.) and 2. I couldn't tell which walls I could walk through. Maybe just make tiles that are mean't to be passageways be transparent. Otherwise, really fun game. good job!