Nice game ! I like the satured colors for the graphics and the "ting" sound is satisfying !
I'm bad, but it was fun. Think personally I could be better with a joypad.
"Calm mode" is subtle, but it permits me to have a better experience.
I think boosts hit box could be increased a little for a easier experience.
If you want to continue te development, and with controls adaptation, it could be a could smartphone game.
Nice job !