Not bad! My team pondered this idea initially but we couldn't figure out how to design levels for it - something you clearly had no troubles with! It's an interesting maze that definitely makes you think about how to get from Point A to Point B.
A couple of execution issues that unfortunately made the game less enjoyable:
- One of the levels' doors led to the wrong place (a different room than the one I came from), which made the world confusing to navigate and I think it might have been a softlock
- The permadeath is quite frustrating, especially when you first shoot an enemy with a flamethrower, and, instead of dying, it charges straight at you. It'd be much nicer, and more respectful of testers' time, to restart at the entrance to the room, for example.
- As others have mentioned, the sound effect for the ice beam is quite unpleasant to the ears.