Solid foundation; it's clear you put a lot of time and effort into this.
A couple things I noticed:
-Some of the flavor text goes offscreen, such as the description for Goliath monsters
-Hilariously, you can go out of bounds in the Hunter's Guild. Some of the wall tiles have no collision
-I experienced some MAJOR slowdown in the basement of the Ruins, but only occasionally. It seemed to go away when I went upstairs and didn't return when I came back down.
-A couple minor misspellings of words and phrases here and there. Since this game is text-heavy it might help to have someone proofread it
-Like others have said, the pixel art can be inconsistent at times
Gameplay is pretty solid. Good work.