Story Update:
Ok so right now I have 6 endings that I'm sure I can create. I don't know if I'll ever increase it.
I guess I should explain how you would even get endings. So for two of the endings are basically pacifist and genocide, which I totally took from Undertale lol. I'm sure it's pretty self explanatory on how you would get them. One is about killing everyone while the other is about pacifying as much people as possible. Admittedly it was a bit of a challenge thinking of how to achieve these endings since it is an open world compared to Undertale's more linear world, but I've got it figured out.
The other 4 are achieved through different means. If you're thinking about how Undertale neutral endings are achieved, that's not what these endings are about. They're achieved through interactive choices. Think of a traditional choose your own adventures.
Map Update:
I guess I should explain how the map works. Basically there's two places that are divided by a wall. The north part of the map and the south part of the map. The south part is basically your introduction and its also easier than the north part of the map. However you're not forced to be in the south part of the map, you can freely go to the north part if you really want to.
Now that I explained my map, I guess I'll talk about some ideas I have planned. The south part starts out with some stuff to do, but not a lot of stuff. That's until your choices affect the world. For example, lets say you kill someone important to the story. That can affect their involvement around the world. Maybe it's some one evil, and now that he's gone, the world can become filled with more people who don't feel ruled under an evil tyrant. Also sometimes you need to circle around some areas in order to find something you want. For example, I have this vision mechanic in the game. I could've talked about this in the Story Update, but i felt it would be better to talk about it here. This vision mechanic is basically a cutscene where you get this supernatural vision of some one doing something. This can reveal secrets you would have to backtrack to get. These are both things I plan for the open world.