Very definition of easy to play, hard to master. A bit tricky to determine the trajectory path when you are on the smaller spinning wheel because it feels there's less 'buffer distance' to get the desired angle, even after slowing down.
Probably this could be solved with fixed angle on each distance interval. Like when the spinning wheel is at 0 degree to 15 degree, it shoots at X angel. Like giving player a margin of error?
But not sure if you implemented them already because the spinning wheel seems to spin at a fixed interval instead of smoothly.
Could really spice things up with moving spinning wheels, and wheels of different color that acts as obstacle, or even spinning wheels that have gravitational field that alters your traveling trajectory like spaceship entering into orbital track of planets.
Of course easier said than done, please take them with a grain of salt.
Overall it's a fun game. Hopefully it would expand with more levels, and potentially becoming commercialized.