I must admit I'm not a big fan of video games myself. There are, however, several notable exceptions. One of the prominent examples of old is Louise Carroll's adaptation of Alice in Wonderland
adventures. As far as the game plot goes, it feels more like you're reading a fantastic book rather than playing a game. Game itself conveys strong spirit of steampunk - there are cogwheel-ridden steam-powered machinery and suitable environment on every game level.
Amusingly enough, game's main theme is called "Flying on the wings of steam" by Chris Vrenna. Unfortunately, I wasn't able to find out any more of his work besides OST to the McGee's Alice, but he is
supposedly going to work on a sequel as well.
It's definitely worth checking out; it should be also noted game developers were nice enough to release both PC and Mac versions of the game. You can get them at Amazon for about $10, which isn't a lot for such game.