Nice game, not the greatest graphics, but gameplay is fun. It has some flaws though. For example I think the system with health and O2 is rather annoying, and contradicts with puzzles, or at least, it's too close for me, so I often die just before finishing a level. Also, it encourages you to rewind constantly. You could have also implemented more story into the game (or at least explain what's going on), and do more with sound effects. Also, I was very annoyed because of the shooting thingies which break your boxes instantly, it's just frustrating and doesn't seem to have any purpose. Other than that, the puzzles were fun, most of the time, so, overall, cool game.