All titles have been filled in for the full ten levels in the next version (currently finishing and testing version 0.2.4). I'll look into Lani's reset code... It's supposed to just reset along with the player, but it's possible that she could be glitched.
The soul box error has been brought up to me a few other times... It's working in my test code version, but I'm planning to allow the box to level up in this next version, so who knows what I will break when that happens.
Potions....... They work for me, but I'll start a new game from this version and see if I can find the problem. My first problem with the potion code was that if you looked at them they disappeared from your inventory. Like schrodinger's cat, only potions. So simply not working is a step up.
As for the sprites, they're made in Maya. I originally intended to do more standard pixel art, but all of my models are in Maya, so that just became the way of it.