Just finished watching the demo and whatnot. Looks pretty good so far. What I can definitely say for sure is maybe put some cues in to tell you certain things are actually happening along with the audio ones. For example, when you water a plant, you could have a voice say you did it or that it was watered. I understand what you were going for there, and what's in place is pretty good, but knowing something happened as well as hearing the voice might actually be helpful.
On that note, the different sounds for terrains are very good and very helpful. I would suggest having something say that you're on the main road or the road that leads to somewhere that isn't town though. Hmmm, how to explain this in terms that would make sense for a sighted game ... So for example, if you have a sighted game and you have a sign or something that says where you just entered, your voice cue could say 'entering town road' or 'entering road to outside of town/are' for the road that leads to other areas that aren't town. Or you could think of it as when you enter a new area in some games, it says where you entered into on the screen for a bit and then goes away. This little thing I mentioned would cover either scenario. Or you could just put a sign when you get onto the various roads and be able to interact with that like you did with Tierramon. You could also have signs for when you get close to the npcs in town or even have them talk when you're approaching them to have them say hello or something as you approach. You can maybe also take cues from a game called the veil that uses similar mechanics when you come up to npcs as well.
You can find a demo for the veil if you go to blindhelp.net. You won't need to be blind there to find it or use the sight either. You can go to the link that says software, choose games for category lower on the page, then choose what operating system you wanted to use for the game. The part you want from the game is the part where you come to the first town. The movement system will be weird and somewhat confusing, so ignore that for now, what i want you to focus on is when you locate an npc. They talk to give you a general direction when you enter their area and then also there's a specific noise for say the blacksmith as well. I mention this game as something you can check out at some point for guidance or reference, not to insult you or anything.
I'll try posting the link here to the page where you can download the game just in case that works (had issues with direct links on other sites, but I'll try posting it here and hopefully it'll work).
Link:
https://www.blindhelp.net/software/vale
For a demo though, it does seem pretty good so far. Considering the time limit for this, you've actually done pretty well. My suggestions of course are from a totally blind person who isn't a dev or coder, so I have no idea how easy any of the stuff I mentioned would be to implimant.
I like the music and the voices you're using for npcs as well; Lupe's my favorite so far. Maybe like with Tierramon too you could add a menu option somewhere to help you get lead to either the town or the out of town road too (not cause we're not capable of finding it if we're blind, just in case we get lost cause it's a big map is all).