Finished it last night, immediately jumped into NG+. I adore this game. From the sound design to the chewy writing to the hand crafted visuals, everything blends to create a comforting, dreamlike atmosphere that's both unique and cohesive. I found the combat mechanics to be snappy and fun, plus gameplay options open up quite nicely as your arsenal grows larger. The weapon, skill and tonic variety is great, I'm getting a lot out of messing around with different combinations and difficulty options now that they're all powered up a bit. And for having such an in-your-face storytelling device as the narrator, Bastion's actual plot is subtly told and quietly affecting. The game doesn't spell things out for you, but there's plenty of backstory to uncover if you go looking for it.
I really don't have many negatives to harp on. The game is not terribly ambitious in terms of level design and the character animations could be more detailed, understandably when you make a game with a small team there's going to be some limitations. There's plenty of content for your $15 outside of the critical path story areas, and perhaps most importantly there are some incredible individual moments tucked inside Bastion that will stay with me for quite a while. One of my favorites of the year so far, bravo Supergiant Games.