The environments are cool, but I ran into some challenges:
First playthrough, couldn't pick up the gun... so I just ran into enemy fire.
Second playthrough, gun acquired. Enemy fire seemed to clip through the wall and I died.
Third playthrough, gun acquired. Avoided wall. Something managed to shoot me and I didn't realize until too late.
Some audio enhancements and other means of passive player feedback would go a great length to making the game "feel" interactive.
Still, great work and great concept!