Download page at Game Jolt
(warning: comments in the page may contain spoilers)
Not really a game according to its creator Heiser Saint, Zzzz-Zzzz-Zzzz has you control a person apparently trapped in his dreams; the objective is to find a way to wake up, by moving from dream to dream. You can make the protagonist walk around, jump, in some instances run and fly, and press the Z key to perform a variety of context-sensitive actions, not always obvious. Dreams are generally small self-contained areas, and there are often different ways to 'exit' them (and end up in another dream). Discovering new dreams and new exits is the key to 'win' this game.
The different mechanics of each dream and the great variety of areas to explore make this a fun game to play, although some dreams can be a bit boring to go through (you'll be likely to explore each dream more than once). Presentation makes it look just like one of the hundreds of pixelated 'art games' we see around these days, but in this case it is entirely justified: the themes explored are interesting, the text is profound enough without sounding pretentious, the graphics are consistent, there are no severe technical problems (a feat considering the game was made with Game Maker).
Getting to the end of the game can take a long time: unlocking new dreams and finding things that make you progress at times require some lateral thinking, and finding your way without help isn't easy. There's also a couple of instances where some skill is required (platforming and other things). The most obscure part, though, is something at the very end (but there's a chance you won't have any problem with that). Finally, the game has several Rewards/Achievements if you're into such things.