Well-made game, but the levels are too easy
This is a problem a lot of puzzle games share. They spend half the game teaching you the basics through tutorial levels, but then never actually gets challenging enough to become truly enjoyable. Some of the bonus levels even felt like tutorial levels and this was an area where they had the option of providing a real challenge. If this game had more challenging levels it would be excellent. Edit: Sorry, my initial review was too harsh. I was frustrated because it is a very well-made game with lots of potential, but I never felt that potential was fully realized. Update: The new levels are great with multiple solutions and enough cards to make each solution hard to guess. Had to replay the first levels again because I had uninstalled the game since last time and playing the old levels made me remember how bad they are compared to the new ones.