It would be nice if the minimap unlocks as you explore, so you can see where you have not gone. Some maps are huge and a bit disorienting (e.g., maps with lots of water) so when treasure hunting/exploring, it would be helpful.
P.S. still working on the guide I mentioned in the donation version, but I am almost done with my 2nd run through of the game (on normal difficulty). I will publish a prelim version 1 once I am done, then redo the game on the hardest difficulty and complete the guide based on that.