This was a really cool game. Really loved the theme interpretation here and felt really innovative. The graphics were really cool as well and it felt very well packaged overall.
I think the physics were interesting, but I'd have definitely made him actionable after 1 or 2 bounces as I feel like not being able to control him after this detracted from the fun of the game. Especially with the spikes being introduced so early. The character felt like he had the same physics properties in both character mode and ball mode so would have been nice if they (friction and bounciness) were reduced for the character.
Overall though, this game was really enjoyable and one of my favourites so far of the Game Jam!