Great but missing one power up
I loved the game but I can only suggest one power up, Auto Infestation, if a disease crosses a bloodcell in automatically infests the cell. Keep everything else the same cause I think this would help people complete the levels with less hassel but keep the challenge there, perhaps with the auto infest it only lasts for so many infests per level or a time limit like the biohazard power up.
Otherwise great game 10's across because I used my imagination to make the effects of the virus funny looking and sounding as well as violent. Nice game, cooll concept.