So the game feels fun and is enjoyable to play, I had fun...
however, this doesn't feel like a game that was built around the theme more like the theme was kind of squeezed into a mechanic that is quite pointless to the rest of the game. It would have been nice if the "echo" mechanic (which is simply bullets bouncing off walls) would have been more impactful.
Overall fun game, weak theme inclusion, still impressive for 3 days ;)