Very fun platformer! Was a bit frustrating at the timed platforms part, but other than that a good 10 minutes well spent. The music and art were really good, and I liked the little squash and stretch the MC has when she jumps.
However I noticed a few minor details, such as the 2nd to last checkpoint being on a block that's too high to reach if a player didn't jump on it, as well as an exploitable bug with the boss. If a player doesn't walk all the way to the middle of the screen, they can spam the hammer and take away health from the boss without the boss going into attack mode. I actually ended up using it because the boss's projectiles were hard to dodge and the player only gets one hit.
All in all, fun game and congrats on finishing it for the jam!