Really interesting concept! Reminds me a lot of Lethal League. I think the sound effects were mixed a little too quietly, I could occasionally hear them a little bit but they seemed buried by the music the majority of the time. It could also be cool to consider how to encourage the player to not just hold down one arrow key the whole time. Right now there isn't really any incentive to be spinning one way vs the other, and you pretty much never want your moon to be sitting still as that leaves you vulnerable. As JW from Vlambeer once said, (paraphrasing) if something is tied to a button press but there's no reason not to press the button, you may as well just take the button press out of the equation and make it a constant effect. Other than all that though, I really enjoyed this. The art was great, and the particle effects and hitstop were really satisfying. Great job!