I think the rewinding mechanic is done very well, each time period has its own obvious and unique mechanic. A way to speed up time if you're waiting to grow up would be very helpful. The art looks nice and fits in well with the backgrounds. The music does get a little repetitive, I think having a different song play for each level would be better, maybe use the other two songs that were intended for the other two time periods as songs for later levels? Overall, I really enjoyed it, great job!