Two suggestions:
Make "Enter" use the currently set tags, so we don't have to keep the tags popup open.
[very minor] I'd like an option to tell it not to make the entrance into water. I like to hide things at the back of the cave, behind water, as I find that judiciously described water tends to freak the adventurers out, especially when it's getting deeper, or with slippery footing. Oviously, I can just hit "generate" again, but sometimes I really like a cave, and then I have to, clumsily, edit the image.
Thanks for a wonderful little generator.