I beat this game as part of the humble bundle too. It was awesome and I was glad to see a fresh take on the adventure genre. The puzzles were just hard enough to drive me a little mad, but the solutions made sense, for the most part.

Steam says I've played two hours of it. It's pretty great except for that part whre I got stuck for a long time, looked up the walkthrough only to find I had missed a very small dimly flashing button. 
 
Also any part that requires me to learn a different game (playing five-in-a-row with that robot) or plan out my moves (that safe in the prison) I just have no patience with whatsoever. 
 
But yeah, otherwise it's great.

I'm about 2 hours into it and I'm enjoying it (this is my first point and click adventure) . I'm interested in hearing more thoughts. When I'm done, I will be sure to add some additional comments. 
 
My only complaint is that once you click on a destination you have to wait for the full animation to play out before you do anything else.

Is it lengthy? I bought it with the Humble Bundle and played a few levels

A fellow Giant Bomber recommended this game to me, and I just completed it.  I'm sure I'll have more thoughts on this game (from the same guys that made Samorost 2), but for now my reaction is very positive.  The game is extremely cute, the puzzles are generally not ridiculous (my biggest problem with adventure games), and the art style is very appealing.  Plus, it includes an in-game hint system that largely precludes the need for looking online for hints, while at the same time being just cumbersome enough to use to make me think twice before using it.  Just really well put together, with a nice little story delivered completely without dialogue.