[HappyHamster]

Yume Nikki, even though its not a game you can buy at a store (as far as I know at least..)
It wasn't to involving, but had enough to grab your attention for a while. The areas you explore look extremely nice with all things considered, they felt just like a dream (which is the point, right?). Even though there isn't a whole lot of action or really anything to talk to, the game was still full of interesting characters (Motoko, the five armed girl, or that mute pianist).
It also made you think a little, as the game gave you no real hints.
Only complaint was how big some of the other areas were, that got annoying.
And the ending isn't deep.
(and theres nothing scary about fucking Uboa, goddammit)