There's something close called ChoregraphAI[1] on GitHub. It simulates the entire map and does a brute force search for what will get it to the stairs. That doesn't satisfy me because it just skips most of the enemies and takes advantage of things that a human couldn't know, like where a bat will move (bats move randomly, while other enemies are completely deterministic). Also, it can't control the game and is for an old version of it (although those problems themselves seem not that big).
But, I do not know what kind of AI could be written to perform the kind of long term planning and strategizing that a human would do (e.g. isolate each enemy to beat it more easily) and to beat the enemies like a human would (with special, pre-practiced strategies for certain enemies or groups of enemies), and even if I did, I get the sense that this would be really complicated for a first try and that I should gain experience making such an AI for a simpler game, though I don't know what.
It might be a self-constrained challenge. It's just been floating around my head for a while because I don't really know where to start.