1) I had Lisa and was controlling her for quite a while, and she remained level 1 the whole time, until I "paid" to level her up. I don't think that's how it's supposed to work. That's just for a boost, right? 2) Is there any actual point to leveling -- like, there's skills and talents in one part of my character screen, but I don't have any idea how you acquire those. 3) Is there a way to earn the currency that lets you roll again? 4) My adventurer handbook is stuck on tier 2 until I improve a weapon to level 10, but how do I improve a weapon? 5) Is there a way to heal without food?
Surprised you managed to avoid tutorials for some of these?
If you go to the character screen and Attributes, the Level Up button is in the bottom right. Not sure what you mean by 'paid'.
It increases stats. I believe acquiring talents is done from getting dupes of the character.
You mostly get primogems from doing quests and exploring, which you can then exchange for the gacha currency.
If you go to the character screen and go to Weapons, there's an Enhance button in the bottom right.
I know the Statues will do it. I assume there are other methods too.