Creating a 3D platformer in a couple of weeks is a great achievement. Well done!
The character controller is pretty nice, it would've been nice to spend even a little time replacing the capsule with some kind of art, even if it wasn't animated, it would've added a lot to the game.
Having to play the game in the tiny viewport is very difficult, especially with the overabundance of tutorial text. Next time you do a jam make sure to click the fullscreen box on upload, it's all it takes.
You could definitely build on this and make something cool, you've got good ideas and the game design is pretty good.
Glad you had fun doing your first jam and game, I look forward to seeing what you make in the future! Please feel free to check out our game if you get the time.