Glad you liked the movement, I spend a lot of time tweaking it. The "mushrooms" were supposed to be bounce pads, but they kind of turned into the mushroom platforms from Mario xD.
Thank you for your feedback ^^ Yeah the physics are a bit janky, it was way harder to code than I thought... I will make a post jam version with more levels and (hopefully) better physics if enough people are interested in the game.
The concept of customizing your character is really neat, the levels where quite fun and sometimes a little bit frustrating ^^. It was a little disappointing to not recieve anything for getting all gems, a little victory screen or something like that would have been enough.