Thanks for playing ! I agree about the boss weapons. There's actually a completely different system in the backend, the boss weapons should be a LOT more rare... This is what happens when you change code an hour before the deadline :D . You're supposed to get health frequently, then a multishot powerup that is rare and the boss drops that are even more rare... They were intended as an "extra", a secret tidbit ... but yeah, bug decided otherwise and I don't want to "cheat" by fixing it :)
BUT thank you so much for playing it !!!!