A cute chick voice. That always gets your attention from the go, doesn't it?
A creative game, that took an AGE to pass. There were, indeed, a variety of enemies, but once I discovered you could swallow their bullets (yes, I know I didn't read the tutorial properly) it became all too easy to pass. Just charge up the massive laser and wipe any virus too large to consume. Perhaps if you didn't get quite as much energy from the bullets it would at least help a little. Being able to swallow the enemy projectiles kind of neutralised the idea of having a weapon at all.
This reminded me somewhat, of a game called Bloodbug, though inverted. Not to advertise or anything, but anyone looking for a nifty little game should search for it on Newgrounds.
Anyways, for such a lengthy game, and admittedly, a very repetative one, I have to say that the ending was something of a let down. Maybe you could add different weapons or different types of anti-viruses as a bonus or something of the sort. Just to keep it interesting, you know?
Anyways, marvellously done, with classic gaming music. A nice 9/10.