It's A great game. Most of the time thou I found myself going through walls with the clip gun straight to the goal and failing on the way. Maybe you could change that with Walls that are immune to the guns? I don't know, maybe it's just me being me.
The clip gun sometimes didn´t work (I think the bullet hit blocks on an angle or was spawned in a block) but that's ok.
Visuals and Sound are also great.
Very creative.