Osmos is a Indie, Casual, Puzzle PC game, developed by Hemisphere Games, available on Steam and published by Hemisphere Games.
Enter the ambient world of Osmos: elegant, physics-based gameplay, dreamlike visuals, and a minimalist, electronic soundtrack. Your objective is to grow by absorbing other motes. Propel yourself by ejecting matter behind you. But be wise: ejecting matter also shrinks you. Relax - good things come to those who wait.