Fantastic game! I'm amazed by the aesthetics of the sounds and visuals!
I really like the mechanics of the clocks. It's really creative and fun as well, but I never really felt like I needed to pay that much attention to the type of clock. Since the goal is always to either to kill all the enemies or get to the next rewind checkpoint, I didn't ever have a reason to not just hit whatever clock was nearest to me.
I'd love to see a room that forces you to think more carefully about the clocks (as maybe a quick example: you need to wait for a platform that moves independently of the enemies dying, so pausing time doesn't work).