Games I like that aren't very well known and haven't been mentioned already:
Rez, Child of Eden, Battlezone.
I could post videos, but at least for the two first games, videos don't really do the games justice, as a big part of it is the feel you get from it while actually playing, and the feedback the game gives to you, which includes heavy vibration usage.
Rez and Child of eden are musical shooters (technically, i guess), with awesome music and really trippy graphics. They are unfortunately very short so it's hard to justify buying them unless you find them pretty cheap.
Battlezone is a RTS/FPS hybrid set to an alternate history space race. Basically, the cold war was actually a hot war, and it took place in space.
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