The concept for this is awesome! There's so many cool gimmicks to use in the levels as well so experimentation with level design is very fleshed out and not shallow at all. Although I did not have a great time with the current levels due to a combination of factors: the aiming for the trajectory would not work because my mouse either couldn't go farther than the bottom of the screen and even if the game window was small, the trajectory still didn't read my mouse position past the screen unfortunately, and the levels didn't have great difficulty curves, but since anyone can replace the levels for better ones this is just by design of the game.
Awesome work!