The Sickening
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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You are the monster; a deadly green vomiting virus infecting the stomachs of your victims. Float your way through stomachs infecting red cells as you go, avoid the white cell or take them down if you are big enough, and watch out for the yellow cells. Infect everything and your dying victim will empty their stomach spreading the virus.