All these games i recomend and are definatly worth having a look at:
world of goo
Fez
Fancy Pants 2
The misadventures of P.B.Winterbottom
box head zombie wars
Crayon physics - And just waiting for Crayon Physics Duluxe
grow games - there all awsome so just play them all
Coil - a strange game that only uses the mouse. For somthing that has no instruction it's a strangly intuative game.