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The final boss now shoots projectiles at the player. I tried adjusting the timing of when the boss shoots the projectiles, but I either have the boss fight being to easy or it being borderline impossible. I should probably accept that the game will have an anti-climatic boss fight.

I thought about having the boss drop some McGuffin item that will end the game, instead of just opening the staircase, but I don't know what kind of item it should be.