This is so cool! I think the main gameplay loop of flying around and chasing the boss ship is a fun idea, and definitely the highlight of the game for sure. Something that may be cool in the future is if killing the smaller ships had an impact too, like maybe powerups to the guns or something like that, or if getting the crown changed something for the next level but you've got a really cool basis here with some great mechanics that I'm sure were hard to code. great job!