Inside is one hell of a follow up to Limbo. It's less haunting and more horrifying. It's conclusion is really evocative, kind of made me sick, but I was impressed nevertheless.
The game is very much about embodying its themes, and it does so in awful, but powerful way. I've come to regard Limbo as a fairly important game, and with this second release, Playdead has made it clear that they take the art of video games seriously.