Anyone else played this yet? I just finished the demo, and thought it was pretty good. Aside from the obviously awesome art style, the music is excellent, and the robot has loads of character. Leave him standing idle for a minute and you'll see what I mean.
Interesting puzzles, but from what I've seen so far, the solutions to some of them aren't immediately apparent, leading to (albeit limited) random screen clicking. Sometimes interactive elements can be difficult to distinguish from the background art, but other than that, it's pretty good fun and definitely a refreshing gaming experience.
You can play the demo in your browser, which is pretty cool. Definitely going to pick this up having played the demo.
http://machinarium.net/demo/