It's a cool concept, and I had a lot of fun running around trying to shoot the sun sphere at the various birds, turtles, and dogs. I couldn't get very far though because it's really hard to control the ball. If pulling the ball made it start following you again, that might make it easier to control? Or if it kept doing damage even after bouncing. Or if you could control the direction of the push a little easier, it would make it easier to time your attacks. Heck maybe even just being able to whack the ball in a specific direction with the mouse would make the bounce control easier. (Like deflecting bullets with melee weapons in Nuclear Throne).
I did run into a bug where the ball wouldn't move after I pressed space, it would keep changing color and getting stronger, but since it wouldn't move I never got to hit anything. It went away after I restarted the game and I was able to play normally.
But overall super cool idea, cool aesthetic, and I would love to see more. I think it's got a lot of potential if you're able to fine-tune the core gameplay a bit and make controlling the ball easier.