The 3D you used here is simply wonderful—I really liked it, from the enemies to the player and the map elements. The numerous combinations and possible paths we can take are great ways to encourage the player to explore the environment with everything they’ve got. Great job.
The music and sound effects also fit in really well, giving it that adventurous vibe. It even reminded me of the classic Kirby with its mechanic of using elements to perform different types of attacks. You introduced this mechanic in a solid way—it's quick to learn and very useful.
One thing that bothered me slightly—not enough to disrupt the gameplay too much—was the abrupt transition from one plane to another. At times, I felt a bit dizzy and even confused by the sudden rotation. I believe if it were smoother, the experience would be significantly better.
Another important factor is that, although it's possible to distinguish the elements in the current plane from those in front or behind, it would be interesting to add a slight transparency to those in front, and blur or darken the ones further back, making depth perception more vivid and easier to grasp. This is just a small suggestion in case you intend to develop the project further—I completely understand that time during the jam was very limited.
Congratulations on all the features you created and for completing the game. It turned out really well, and you made excellent use of what seems to be inspiration from Kirby. I wish you the best of luck in the jam!