Very cool game design!
I love the idea of quick progressing with various platforming upgrades.
This seems like a very good proof of concept game.
I couldn't figure out how to purchase an upgrade for 50 from the skill tree. I had more than 50 crystals and trying clicking, and pressing various keys but I couldn't purchase them.
It would also be nice to have an options menu to tweak the controls (I wanted to press Spacebar to jump), and tune the sound and music volume.
This gameplay direction has a ton of potential!