Most important:
Patapon 1,2 and when it comes, 3!!! (or else I'll find you and...)
Next important:
LocoRoco 1, 2 (2 is the best IMO)
Pixeljunk monsters deluxe
Patchwork Heroes
Half-minute Heroes
The Prinny series: IF you like hard games
Badman series
Echochrome & Echoshift: perfect puzzle games (if you like puzzle games that is...)
Games that might not bode well on heldhelds for some:
God of War: Ghost of Sparta (better story than God of War 3 by a large margin, nowhere near as good a game though IMO but still awesome)
FF7: Crisis Core (First 2 hours was slow but it starts to pick up and turned out awesome/ I even cried!)
MGS5
Daxter
Wipout
Things I recommend staying away from because you don't live in japan and can't take advantage of the series only plus:
Monster Hunters
