Very nice demo!. I learned a lot.
Just some opinions:
- the air acceleration, control and brake toggles (on the jumping tab) are not explained at all, not on the voice-over, nor with a (?) icon.
- the speed toggle in the Lean section in Juice tab, is not clear either. I found out it is the speed at which the character leans as it runs, but is not intuitive. Plus, I think it has a bug, because if you change direction immediately, the character also leans immediately, instead of leaning back and forward again (at such given speed).
- some preset icons are not clear. I'm guessing mushroom is mario, Strawberry is celeste, bandaid is meatboy, but the circle is sonic? it is not clear at all, and I only figured them out because you mentioned on the voice-over, but they should have labels or something.
Also, it is NOT shown anywhere if you have chosen a preset other than instantly changing the toggles. It should show an icon as an indicator of "current preset" or something.
And as an extra, I attempted to use a Dual Shock 4 controller, but at least on the browser, it didn't get detected (I use DS4windows). I could try downloading the 'game' instead of just in browser, but it should work there regardless.