Okay so this was really fun! Got a bit stale after a while, but you can say the same thing about Tetris or Snake. It is one of those games I could see myself coming back to during a boring lecture or online meeting. All in all great game!
I also love that the enemies has no regard for their fellow comrades and will not hesitate to shoot each other in the back of the head if there is just the slightest possibility of actually getting a hit XD
Really neat mechanic!