Cool idea with the ball physics, almost feels like Uniracers for the SNES (a relic of the ancient past).
I was able to basically fly everywhere and break through the walls at one point with an infinite scroll wheel but it was pretty fun anyway.
The minimalistic graphics are neat, and a good use of four colors with an unusual palette and clear contrast.
I think some kind of compass or arrow, or a pre-level fly-around, or some sort of map/minimap would be a good improvement to get our bearings on the level.