Really liked the music. I actually didn't mind the simple pattern for the first boss, I think for a first guy it's fine especially with more tweaks to the upgrades for each death. Second boss, I think the player's hitbox is actually a bit too small and/or the player's movement speed is a bit too slow; I was begging for death chasing the blue bullets around, haha. Neither of the 1st 2 boss' hit flashes worked consistently for me, they'd usually play/show for the first 1-3 hits and then never show again. The healthbar still went down so I knew I was hitting them but didn't feel very satisfying to do so. If there's a guy after the 2nd one, I didn't get to it, sorry.