Here's some feedback on your game:
1. Theme
The idea is nice, would really fit a calming game, but...
2. Gameplay
...unfortanetly the game gets really hectic after a while. I would like a more calming, slow, puzzle-kinda game where you can dash the balls into each other, but they don't have that much reach and you have multiple colors or something like that. Plus, your game would really benefit from an in-game tutorial. Also, i didn't know what the timer is and what you need to to in that time to not die.
3. Graphics
The graphics really fit the game and look nice, but the base doesn't quite fit to the rest of the artstyle.
4. Sound
The music is really calm, but some satisfying sound effects for everything would be great. Generally - add more player feedback! Sounds, particles, the score going up with a nice animation - little things like that can really improve a game!
I hope my feedback helped you a bit, and if you have time, it would be really nice if you could check out our submission too. Thanks! :)