I love the presentation of this game! It has great juice, awesome music, and really cool minimal art style! You clearly spent a lot of time on polish and it shows. Having to sacrifice total time to defeat the boss for more damage is a really cool risk/reward mechanic as well. The button prompts in the background is also a really subtle way to teach the player the controls.
I feel like this game might be a little too hard for a jam, but other than that this is an outstanding showing!