There's a vague hint about how to beat the boss in one of the glowing orb thingies that gives you flavor text. It's quite cryptic though and the whole boss mechanic (and the game in general, being a game jam game) is a bit of a hasty job overall, I was kind of learning as I was building the game, so the whole game is pretty much just trial and error from start to finish. Lots of overlooked stuff and missing basic features.