A wave-based shooter game in which you control a mouse cursor and must defend your computer from viruses which fall from the ceiling. Between waves, you can buy more mines and upgrade your range and speed. If you're in trouble, press spacebar to use a special firewall attack.
This is it. You have finally infected the host organism. Collect RNA (that's ribonucleic acid, the little brother of DNA) molecules in order to produce more microbes. But watch out - the organism won't give up easy. Destroy the immune system, consisting of phagocytes, or else your microbes will be destroyed.