You might also want to add cross-play games since... you know you get the game twice for the same price.
psn games with crossbuy that come to my mind:
-Sound Shapes
-When vikings attack
both great games and absolutely worth the money
then there are ps allstars and ratchet and clank full frontal assult and i think sly cooper thiefs in time comming up for cross buy
also you could add that lbp vita is basicly an (almost) endless game since it constantly gets new leverls and you never run out of stuff to play...