I have been playing the new PlayStation Plus Instant Game Collection Games. Most of them are pretty grand!
The Unfinished Swan
It's short, but very creative and arty. There is virtually no incentive to play the game again, because all the surprises and puzzles aren't quite as interesting the second time. I would recommend this game to anyone looking for 2 or 3 hours of creative puzzles and inventive dream-like story telling. So it lasts about as long and replayable as Limbo, but feels like it was made by genuinely smart people… unlike Limbojk
Murasaki Baby
This is yet another relatively short and creative game. It's incredibly creepy, but a nice change in atmosphere from every other game on the planet. I haven't gotten to the end yet, but I have a good idea for how this game will play out. I'm sure this game could have been much better if it weren't for the awkward touch controls… and I am a very tolerant person when it comes to the Vita's touch interfaces.
Race the Sun
This game looks nice, sounds nice, and plays well. It's pretty tough, but I'll probably keep coming back to this when I need to play a game for a few minutes to kill time… or I could just sit down and play it for hours on end.
Then there's Guacalemee which is awesome, but I've played and enjoyed it on PS3 and Vita before. And Hohokum which I'm still trying to get my head around. I suspect this game is not my sort of game.