I got to round 44 of the middle difficulty; it was an awesome game! I loved how you made each of the viruses identifiable: trojans, worms, spam mails, it was good for a laugh! Maybe you should make one for the ultimate virus: the keylogger (perhaps 2 keyboard buttons making a face like ;P or xD? Also the more powerful units like trojans give too little money, i was starved for cash after round 30. Keep it up! 5/5 10/10
it gets hard, but try to use the lase gun that you buy for 620 points. it helps alot.
Good game here, but gets a bit to difficult to fast.