Thanks for the feedback!
Yeah, the setting could probably have less exposition dumping - the important stuff is really only the last part, which is sort of the wrong way to go about it! :D
The D20 rule - yeah you're right, I should've mentioned this. It's perfectly fine to use other another die when it's a better match.
Glad you liked the map generation! To be honest, it felt a bit thrown together (the rest is things I've been thinking about for a long time), but it's a good start.
The first page may be a bit off-putting, which was not my intention of course :) I didn't have time (nor energy!) to go through and do an edit pass on the game before submission unfortunately.