Really cool game with intuitive mechanics, however, a little critique...
• Make the screen shake/tilt random, it gets a little repetitive from time to time
• Switch up the soundtrack a little, or perhaps make it a little less distracting? Maybe quieter? It just gets a mildly annoying after a while.
• Add a bit more easing to the animations, it'll make the game feel so much more fluid. Maybe even add some easing to the movement? It'll mess up your collisions a bit, depending on how you wrote your system, but it'll make the game feel a lot smoother.
• Allow key rebinding, it'd be so much more fun to play if the time-stop key was something like "Space"
All that critique aside, I can really see this game going far (I especially love the colors you used!) I wish you the best of luck in developing and refining this :)