I got to a big room with a door that wouldn't open. If that was supposed to be the boss area, then I think it would've been better to have text appear along the lines of "end of prototype" so it wouldn't appear as a soft lock. Other than that, I think the default weapon (the long range one) shoots too slowly, and the jump loses momentum too quickly after letting go of the button. I also managed to get through all the rooms I found without fighting at all, but I don't know if that's bad or good.