Thanks i'm glad you liked it :)
Yeah even if it's a jam entry i wanted to have at least a bit of variety so i aimed for 3 and i hopefully managed to make it, it was a lot of work though, but since it's a shooter and they're just backdrops with no actual tiles and level design this was more managable at least :p
Oh sorry about that :( i didn't experience any litteral crash when testing, so i'm not sure what happened there, do you remember approximately when during the boss that happened so i can check and see what could have caused this, also could depend on what browser you played in.