Okay... I my score is 12 days, haha. Now, my review:
The concept is not that new but it's awesome anyway. The retro music is pretty cool, the graphics are good for this kind of game.
Sadly, I know I said before that the music of the game is pretty cool, but it actually is the same music used in Infectonator 1 & 2, that's boring. There should be more upgrades and more bosses. And also, I would like a 2 players co-op mode. But that last thing I said is just something I would like. :P