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I think there's a lot of design space that can be explored with this set of mechanics, and another boss could totally be feasible (in a separate cart, since this one maxed out the PICO-8's capabilities). But I'm probably not going to be the one to do that. I have every intention of making more boss fights (I think boss fights are a beautiful game design challenge) but they won't use this set of base mechanics or be in this "world".