Must have PS3 downloadable games?

[okr]

Flower
(I thought nothing can surprise me anymore, but this game is one of the most surprising videogame experiences I ever had and imo the best download-only game created up to now; one of my favourite games of this decade)
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Critter Crunch
Shatter
Zen Pinball
Braid (I have the PC and Mac versions, but I'm sure it's great on any system)