Gragt
Arcane
Of that list I only know World of Goo and Bit.Trip Runner. Since you already know WoG, I can tell you that Bit.Trip Runner is fun but challenging. The levels actually aren't too hard and if your objective is to finish the game fast you'll need only a few hours, but the main challenge is to get a perfect on each level by collecting all the jewgold, and some of the levels can be really hard that way. And then the next objective is the get a perfect on the bonus stages unlocked by doing a perfect on the main level. If you like arcadish games with a good deal of difficulty, you'll like that one. It also has a beautiful retro-look.