It took a while for me to get the timing right, but it was fun to beat each level. If you feel like finishing the game after the jam is over, you could add some kind of indicator for when the bullets will be fired, ex: having the opponent flash red a second before the bullet is fired, or having a short timer count down next to each opponent to show when they will fire a bullet. The boss battle looked like it would've been fun to play, but you did well with the levels you completed 👍