Fun and easy to grasp start for a platformer! I could absolutely see this being taken to a full scale game. After beating all the levels, my main feedback is that I'm not a huge fan of the shields on the spheres as it means there's no way to get to a sphere from above or below, plus it can be a bit frustrating when you dash towards one only for the shield to raise right before you reach it. My other main feedback is that I think it might feel better if the speed from launching from a sphere didn't get cancelled if you're holding an arrow key during the launch, and holding arrow keys can sometimes cause you to clip into a sphere when launching from one. It might also be interesting to make each sphere spin at a different speed so you can fine tune the difficulty of each section of a level.