Actually, this was pretty good. I had fun playing this. Suggestions for improvement:
-I can't access potions in combat.
-I can't upgrade items that are equipped.
-Add a view of the character stats in the item equip screen. I know numbers are red if I don't have that level yet, but seeing their stats would help.
-I'd recommend a better 'Save' menu. It doesn't say it's saving, and it restarts the game, yet with the info saved.
-Yes, movement on the overworld is rough. Shrink the hitboxes on things we can't walk through to make movement easier.
-Make a fight tutorial in the tutorial somewhere. i wasn't quite sure how to fight til I was in one.
That's all I can think of at the moment. All in all, the game was a nice distraction tha I spent way longer than I'd planned on. Keep at it. :)