This game was clearly developed on some other platform and ported to OS X. Even though there's a menu in the OS X menubar, everything is accessed through the single, fixed-size application window. The graphics are rather crude, and most of the backgrounds are low-res.
The game itself is okay. It's a good way to pass the time, but it's not terribly challenging (you can successfully complete the game every time). I've played better mahjong solitaire games, but for it's worth $2.