.flow is a
fangame of the original Yume Nikki made by a user called "lol" (pixiv and Twitter accounts). This game is known for its eerie atmosphere.
You play as a girl named Sabitsuki who doesn't want to or is unable to leave her room.
Unlike most Yume Nikki fangames, you get in bed to save and access most of the gameplay by interacting with the computer.
There is no plot other than to collect all 25 effects. Once you collect all effects, you can leave your room to end the game, or you can keep playing for more endings. Your computer in the 'dreamworld' will let you "drop" all 25 effects once you have them and you wake up with your name now Rust. As Rust you have no effects and can't collect any but you can go to places inaccessible for Sabitsuki to have various endings.
You can download ver. 0.10 in English here. (japanese locale not required)
You can get ver. 0.15 in Japanese here.
You can find effect guides, locations, maps, and event information on the .flow wiki