Thanks for checking it out! This is great feedback, all of this is clear and helpful. You'll probably see some kind of compass in the next release.
"One last nit pick is that the game doesn't run in the background so you can't turn off the screen or switch apps while you explore to the points of interest."
This is probably not a particularly easy thing to change. I do want to see if I can make this happen eventually, but I am aware that this isn't a thing Android likes to encourage and Godot doesn't have an out-of-the-box answer for doing this.