I was looking at this too. How much customization is there? That's a huge part of it for me. Can you give me a bit of a review perse? I'm broken as sh*t but I really want to pick this up (co-op later? sweet!)

So, you start out with 3 pre-made characters that you can change out for new ones.  The customization comes when you level up and or add modifiers to your characters.   You will not want to become too attached to your characters as you will lose some of them (Permadeath is not quite clear yet, you typically have to die several times before it is permanent for a character, you don't lose your save or anything).   

You can customize your characters but not as much as in most rpgs.   However it ends up being a lot as you hire different characters and specialize them as they get experience.   Really you are going into a randomized dungeon with a small party of 3 characters looking for loot.   It is fun for $15, and offers a unique atmosphere.   If you are hesitant, definitely wait a week until it is released and see what the reviews say.

I had some fun with the public tests, am waiting for the release.  

Now that I have it downloaded finally, it's a pretty decent game.  Much better than you expect from an indie team so I'm wondering what their other games are like.