Wooow, this game is incredibly polished and a solid submission! The level of juice this game has is unmatched and incredibly aesthetic. You killed it in all the departments when it comes to making a game!
When it comes to feedback, I can't really give much, however, I think maybe--if you do continue this project--building a narrative might be valuable. When I think of other minimalist games that I have played, I always wished that they had some sort of narrative or motivation built in to seek the challenge. I always remember "Thomas Was Alone", that game was literally just a cube platformer, but the game had a narrative that immersed me to recognize that they were more than just cubes. I'm bad when it comes to "time-crunch" style of games and think some defined purpose or motivation behind guiding are little "white sci-fi-esque slime ball" may have pushed me to keep trying and play more than I did.
Like, what is the ball? Where are we? Why are we building a path up? Why are the green shapes bad and kill us?
I think even though it is a small detail, it will help connect peeps to your game more. But regardless, the game is incredibly fun and visually stunning~!