Very cool concept, would be very fun with time constraints and other mechanics to pressure the player to deal damage to the enemy quickly. Great job!

I loved the idea of your past actions becoming what you have to respond to in the future. My game utilized the concept as well, but not in a rhythm focused way like you.

I think something that could add a lot of depth to the game would be to increase the BPM over time. Then starting off the BPM slow could make the game easier to get into for non-musical people, and then kicking up the BPM can reward people who love the game.

cool concept and the art style is awesome too haha, good job

That's a really interesting idea! Pretty cool that you set the rhythm then have to match it afterwards, which then gives windows you cant attack the enemy in after (unless you wait for the next bar) Good stuff