I liked the time effect mode and the cloak as well! Graphics are fun and quirky and the fights were fun :D
When you start a level, you can't move right away, but the enemies head towards you already and start shooting, that felt a bit annoying, obviously you can just cloak straightaway.
Overall good game and fun to play, maybe add some kind of WIN state/scene as well, so it doesn't go straight to main menu. Kind of kills the mood when you have killed all the robots and got the key and got out and then it just goes straight to main menu.