The physics of the game is really interesting, I like the concept of changing from liquid, to solid, or changing to a Stoic structure.
A short tutorial at the start to teach what each state and what the stoic structure is meant to do would be good.
I spent more time in the game trying to recollect my balls than actually completing the game. Though a lot of times I mess up my controls, like trying to collect my balls when I have mass attaching toggled off.
The programming required to make this is not easy, and I can see you spent a lot of time working on it and the game mechanics. But I feel a better level design and tutorial to teach these mechanics would be great. I really like grouping as a bunch of balls and going full speed and slamming into something to break it. Would love if there were more mechanics like this.
The game has amazing potential, I can see how you can expand this game’s design and content to make full use of the physics you spent so much time on. Some music and sound effects would also do really well. Great job!