Thanks for letting me play your game! Really impressive for 12 hours!
First impressions: Found the game mechanic actually nice and responsive, despite first being being worried about the control scheme - it actually worked nicely. Implements the theme well, its nice to find those extra time pickups and there is an element of a maze game to it. I liked that you show the ending then rewind back to start quickly - almost to give a bit of a hint as to how to get out to the player before the start a level. Awesome job!
Constructive (honest) feedback: You didn't have much time, so don't take this too seriously - but the visuals could do with some improvements. Even if just the main character, I feel moving a blue ball around lacks any personality and could have added some fun to your game for an extra 20 minutes of art. Would have been good to have more levels. The check points seemed to stop me from moving for a second or two when I restarted from a checkpoint FYI.