The puzzles are fine, but...

- videos are not working on a newer OS, so you don't really know what's going on in the game and there's no update in sight
- bugged achievements (I didn't get the the ones for the last region and finishing the game, even though I got the one for getting all chests, wich is also only possible if you beat the game)
- in one level it happened two times that characters randomly got teleported to another one and were stuck, so I had to restart the whole level...