I get why it's a rage game, but honestly it didn't feel intentional. From the basic art to the lack of theme it felt a bit phoned in. So as some constructive feedback here's what would have made it feel a bit more . . . purposeful.
Firstly the controller: a rigidbody controller with no rotation constraint. So to make it a bit more enjoyable to control (while not more easy to win) you could make the player move curve speed up a bit faster (rather than starting at zero). The rotation was good though.
Besides that I'd just recommend using the time that doesn't go to balancing to improve the art. Even to just make a proper title screen rather than just text. Even if it means making less levels.
I did like controlling the character though, and the music and sounds were great.
That's all really. It's not that bad actually, it's just that there wasn't much to love in particular, it just felt kinda ordinary. I hope you don't take this the wrong way, I just read on the game page you may update this game, so I wanted to help.