I played on desktop with a mouse, though this feels like it would be better on mobile with touch. I played a few times and my high score was 1068. I like that the healing sparks spawn each time you are hit. They do feel like they may spawn a bit too close, as I was able to generally grab them as was swiping to hit the incoming threats and not need to focus on balancing the need to defend vs heal. I initially played full screen, but then went back to the default size. My strategy was largely to move up and down across the star with a bit of zig-zagging over anything I touched, and sometimes switching to spiraling, depending on where things were.
I think some background music would be nice.
Overall, this feels like a nice little mobile game to play when you have a few minutes. You have a good start here. It could be fine with a bit more polish, or you can take it as a base and grow it with additional features, such as power ups, or temporary effects.