How is this game a platformer, what spin does it bring to the genre?
It's a 3D-ish platformer with my own rendering, built on top of the Löve engine.
You can jump and you can run, and honestly I didn't think about this part enough^^

What theme does this game use? also explain how you implemented the theme
Metamorphosis! You transform after sustaining a spin in the air for a longer amount of time the mechanic pops up at level 4, which makes you able to fly via endless double jumping.

Did you use any AI or PREMADE assets in this game?
Most of it was from scratch, only the coin sound comes from a different unrelated project.
Code was all written by me, assets were all either recorded by me or made in my own 3D-editor for this engine (which existed before the project. I regret that part, because it's ass to work with)