Fun game, I love the daisy chain effect you promised in the title and had a lot of fun zooming. I agree with some of the other comments, hard to swap directions once you are going. I also didn't have a big enough incentive to make my orbit bigger, I was just happy keeping at a small one and daisy chain killing enemies away as I looped.
If you have power ups for stronger bullets, multiple bullets etc. at different radius, I can see that pulling me out of my comfort zone and playing with the risk and reward. Especially if you introduced more enemy types that need to be killed in a different way.
Awesome game, lots of potential. Would love if you checked out Orbit :) GO SPACE!