Whoa! The swine flu!
Awesome! At some viruses I even thought "Eew. I really don't want to see THAT one grow..." but it was fun. Even though I think it's too short, as DarthJin mentioned. Maybe add some more harmless to get started? For example, why not heavy coughing? Then I'm sure *HA- TSCHIW!* I'll get 'cured' too... *COUGH COUGH* ...Man... *WHEEZE!!*
Not bad.. Could be longer.
Not to bad for a game.. but I kept running into the problem of knocking the enemies into the virus itself. Maybe it was just my higher mouse sensitivity, but it was just a bit harder to control the orb at higher speed levels. (Resulting in more enemy knock-ins)
The game felt rather short.. Didn't even feel like I had enough time to test all the power-ups. I guess people could play through it again, but once I'd beaten the game it didn't have the replay kinda feel.
I wish everytime I was sick it was at least half as fun as this. Good work !