This game is seriously awesome. I just have two main critiques: A lot of my deaths felt unfair. There were two ways this could happen: either I died the moment a new loop started (maybe I spawned inside a past me?) or a bullet would pass through a container and hit me. Neither of these felt good.
Also, sometimes there would be a ton of bullets flying at me and it would feel like I should've died but I didn't. That one isn't as bad though.
There seemed to be a bug after the tutorial in which I was playing the game, but the main menu was still visible. Other than that, it's a great game with a great concept. I think you could have done more with the portals as I ended up just shooting straight at the enemies most of the time.
