Thanks for the feedback! I'll definitely think about bullet size and the boss hp some more. Turning on the player hitbox indicator might help avoid bullets if you haven't tried that yet.
EDIT: I should also mention in case you aren't using it much, the "focus" mode of firing is really important for damage output as well as maneuverability.
As for the infinite continues, that was on purpose for this submission. I wanted it to be accessible for anyone that isn't as skilled at these types of games but wants to get to the end. And you can always restart when you die instead of continuing if you want a little more challenge. A full game version will probably have a limit of some kind, but I haven't thought that through yet.