I won this game the same day I bought it. The science puzzles were the most challenging but even they weren't hard enough. Since it only cost me $20, I'm not too mad.... just disappointed.
Hopefully, in an update, they'll release some more puzzles for the game.
Basically, the game play is nice and many of the games, you'll find that the same solution works in those situations also. It's a bit challenging but not hard enough and definitely not long enough to recommend purchasing, IMO.