Honestly after playing Tales of Mystra, I can understand why you'd want to save game balancing for last. The balancing in that game is pretty bad and it's almost impossible to get strong enough to do anything. Too many enemies that 1-shot, too many enemies who are practically immortal, the world level being hard to compete against, etc.
HOWEVER, I don't recommend saving it for last. When the full game's out it's gonna be pretty boring when every enemy gets 1-2 tapped. So I'd say try to do it as you go, but include a few items/settings that lower difficulty and makes fights substantially easier. AND a warning that makes it abundantly clear that the fights may or may not be balanced.
Also as another suggestion please make the menu sounds separate from the actual sounds in the options menu so I can lower their volume. Selecting something in the menus is sometimes really loud compared to combat, walking, the intro cutscenes, and growth scenes.
Anyways, good stuff so far. I'm decently intrigued by it and I very much enjoy the character designs. Whoever did the pixel art for the characters did a good job btw. Unless it was an Ai in which case it only gets 1 pat on the back instead of 3.