I love the graphics and sound - more than once Olaf and me said "mmmhhh..." at the same time :-D
I wasn't good enough to solve the room puzzles. Got stuck in many places - always thinking "okay, now I have it...". The doors were misleading many times - to me, they should be walkable after Olaf repaired them.
Oh, and game can only be played in Chrome, but not in Firefox (warnings are coming up).