This is a good autobattler. It'll be better when other classes are available.
One thing I've found that's not immediately obvious is that the 1-star and 3-star bonuses for upgrading equipment are permanent, even if you're not currently using that item, so it's worth it to invest into refining multiple items.
That said, I don't understand what the "+3 Weapon/Armor Tree" perks do. EDIT: Figured it out, there's a limit to how many equipment upgrades you can have and this increases it.