yeah, the boss not letting you know he is coming is a bug and it can be pretty annoying and make the game feel unfair. the boss is supposed to let you know he is coming before hand, but I wasn't able to get enough playtesting or fixing done in time for the deadline, but I've fixed it not too long ago along with a few other small changes and I'll be uploading that build after the jam is over with the fixes. thanks for playing and for the feedback! it really helps for future projects :D