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There are multiple new locations.  The new enemies are in one of them, which the bartender will give you an indirect hint about how to find them.

this ultimately leads me to the mushroom isle where there are no enemies or really anything at all. now i'm supposed to go back to the room which you must be invisible to enter but there doesn't seem to be anything to do there either. no enemies for sure. what am i missing?

(+1)

Maybe a different drink will help you find the missing book while you're in that room.

(+1)

maybe thank you

Is there anything that's supposed to happen after that? I took a stroll with what's-her-name and we just fought zombies over and over, and nothing else seemed to happen.

There's more to the walk in version 0.69, which is currently available to Patreons.  It will be available here after 0.70 is released on Patreon.