This is incredible, especially considering how long you spent working on it. Would definitely be interested to see this be built upon into a larger game.
Two main things that stand out to me that could use work:
- Controls should allow you to drop down from a platform. You can jump up onto a platform, but not drop down.
- Some platforms look as though you can jump up onto them, but your jump is a tiny bit too low. General rule of thumb is that if something is intended to be inaccessible to the player, then make it more obviously inaccessible. If a platform is too high to jump on, it's better to make it obviously too high, than make it seem like it might be possible. This is especially important given you have a time limit.
Overall though, it's incredible you got this assembled in the time you did, and I'd definitely be interested in seeing more of this game if you decide to work on it further.