really love this entry, can barely find fault. But I will, because constructive criticism is important 😉 n.b. this doesn't affect my rating, in being nitpicky because it's such a great entry and if you want to make it an actual game there are a couple of little improvements to be made!
As I said in the twitch chat while Ducc was playing, I'd love to see all the balls be consistent - make all of them yellow, make it so your own ball hurts you and make it so none of them disappear.
As piggy said below, visual indication of slow mo would just add that little bit extra polish and improve the UX - but it's only a minor issue.
Seriously good entry, I am impressed!