It's fun, but...
Aside from the fact that after killing the robot-thing i got a game over, for no aparent reason, instead of a congratulations or a chance to play the last level or so, the two things tha spoiled part of the fun was the no switching back weapons. It makes it a lot less useful to have so many, cuz you'll only use it once, and the fact that health present only spawns loke twice in the hole game, usually in the earlier rooms, and when you're in full health.
But nonetheless, an excellent effort, it was well worth of my time =)