I didn't back the game, or follow the Kickstarter much at all, but finally got some free time and bought the game on Steam.
So far I'm really enjoying it, but I don't know how far I actually am into the game, so I can't give much more than a first impression.
The game is very much in the style of Planescape: Torment in that its very narrative focused and revolves around understanding your characters history. You can almost always avoid combat and so far I don't think any part of the main story has required any combat at all. I haven't experienced a lot of combat, but the combat system doesn't feel good at all (the one major fight seemed to drag on forever), so I almost feel as though it's better to play a character that's more focused on dialog than fighting. It's got a turn-bases system that really needed a fixed grid, because the current style falls incredibly flat and feels like more of a chore.
The writing is reasonably good and the world so far is interesting. It seems as though there are typically more than a few ways to solve most problems. The game system is somewhat unique, and typically doesn't punish failing skill checks too seriously. However, the character build I've been using might make the system somewhat trivial as it seems as though if you aren't combat-focused as a character, it's pretty easy to be good at most skills to the point where you'll never fail if you don't want to. Even if you fail in a way that should kill you, death works in such a way that it's not a permanent problem.
Unless you're a serious fan of the genre, you can probably wait until it goes on sale. I'll try to update once I get through the entire game, but that may take a while since I tend to go through a lot of the optional dialogue in trees and explore a fair bit.