I like your take on the theme, it was pretty interesting to move the player around, it feels like a planet moving around in outer space! I thought it was super cool that you can change the radius of the players pathway around the circle and that the max speed of the player depended on their distance from the center. This was a nice touch and added a good amount of depth to the movement system. The UI could use a little bit more love but it does a good job of displaying the necessary information. The style of the player and boss doesn't really match the backgrounds style and I wish the player and boss character designs had a bit more personality. But I dig the look of the background. One criticism is that the controls feel weird to me, I think it would be much more intuitive if you used only WASD or arrow keys rather than splitting them up. Or maybe allow the player to re-map the buttons instead. Overall, I think you have a very nice take on the theme with a solid core gameplay mechanic that would be even better with some more polish and content. Good job, and keep making games!!!