Free:
Most can be found on
http://jayisgames.com/ or google
Rakuen no Guardian (Guardian of Paradise)
Logigun
Spin the Black Circle
Oroboros
Karoshi, Karoshi 2.0, Karoshi Factory
Click Drag Type series
Shift, Shift 2, Shift 3
Wubly
Frozzd
Dino Run
Submachine series
Cheap:
Audiosurf
Vampire: The Masquerade - Bloodlines
Penumbra Overture, Penumbra Black Plague
Warcraft 3 TDs