I like this game, though if there's anything worth nitpicking, it's that custom maps don't give you control over everything. I was hoping you'd just be given a blank room where you could make your own paths, put doors where you wanted, and so forth. Is there a mod for that? I don't understand how to use mods really well, but I would enjoy being in full control of how a custom map is set up.

There is an editor available where you can create your own map or edit an existing one.