Vivirion, an arcade avoidance game by Mortar Games, has you controlling a small. fragile creature, attacked on all sides by a hostile environment. But with your guidance, the little guy is sure to triumph over every adversary, and thrive in his evolution. By the way, did we mention that said creature is a virus that has infected a human host, mutating into ever more deadly pathogens? Yeah. In retrospect, that's actually pretty central to the premise.
Direct your chosen virus with the mouse, gaining health by consuming smaller enemy cells, and avoiding the larger cells which will take health away. Turning on the "Cell Size Assistance" option will mark smaller cells with OK and larger cells with an !, but generally it's easy to eyeball the diameters. Also, watch out for the white blood cells, which will actively try to hunt you down. Collect bonus cells to gain a temporary ability boost. At the end of each level, you'll upgrade your attributes and mutate into a stronger form. Overall, the gameplay is reminiscient of Fishy, though the circular sprite designs make it much easier to distinguish the different sizes. It's a little slow going at first, but the eerie atmosphere and a surprisingly affecting (even slightly nightmarish) final level make Vivirion worth playing until the very end.