Matches come from the tags Steam players vote on each game, weighted so a rare tag counts for far more than one that sits on half the store. A game's popularity never moves it up this list.
The closest matches to Osmos on Steam are Zup! XS, Obulis, Zenge, Splice, KAMI. They rank highest because their Steam community tags overlap most with Osmos's, and shared tags include Relaxing, Physics, Casual.
How are games like Osmos chosen?
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Relaxing, Physics, Casual count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Osmos's. Popularity never affects the ranking.
