This game was very fun! I really liked the level where you have to freeze a box in midair and jump on it, that was very creative!
Though there weren't many levels, every single one was very good and had a point to it, I liked that you slowly introduced the concepts and gradually scaled the difficulty, I'd love to see you add more levels to this game!
If you do decide to keep working on the game, the next thing I'd add is sound, especially when freezing and unfreezing time to indicate it to the player. I'd also change the way you make the player move to make it smoother, since landing on small platforms is a requirement (Instead of controlling the position, the player should control the acceleration)
Great job!