Your a parasite. You like to eat blood cells. The hosts body is trying to kill you. survive as long as you can. in this intense game its a fight for survival, use everything you can from upgrades to chemical ombs to stop those bloodcells from getting past you and sending antibodies in.
You can download the game here for your site:
http://download.krazyletter.com/games/parasitex.zip Use your mouse to kill the blood cells and upgrade.