I've been waiting for this second demo for ages and I'm incredibly excited to see it come out. Fantastic job, A+++ to the developer; they nailed the exact spirit of what I wanted and expected from before, fixed the minor issues from the original demo, and basically nailed exactly what they were going for.
If you're a fan of stealth/sneaking, if you enjoyed classic Thief, if you like cool worlds and interesting stories, play this. If you like to steal everything that isn't nailed down, play this.
If you want to support a indie dev who works hard as hell, play this.
If you're still not sold, watch my playthrough here. And then go play this game.