Solid concept.
As previously mentioned, the camera could use some work, and perhaps some indication of damage done/left.
Other than that, i have no compaints
Is it just me, or is it taking far too long to load the game?
I'm also getting instances where I'm fighting someone without being able to see what's going on.
Just as a note - There are a few spelling errors in the first dialogue screen. "Its" should be "It's" and "I think you can figure youre way out of this" should be "I think you can figure your way out of this"
At the last level, go as long as you can without becoming a virus, but don't fret! If you become one, it's actually easier! Then just run around and wait for the enemy to divide then gobble them up!
Good strategy - fill your first few elevators with the basic turret, all three slots. slowly replace them until you have a machine gun, rocket launcher, and laser. But for the first many floors, use only basic turrets. They are sufficient for your needs
Oddly I'm having to reload the page twice before it will let me play. The first two times it pops up with the "play" button immediately, and on the third try it actually loads.
Just a heads up
The comments that are the highest rated have pretty much hit on everything that I want to offer as possible improvements, but also the addition of a pause function would do wonders for my enjoyment.
 "Last Minute Hero Preview"){kind=icon}
 "Doom Forge"){kind=icon}
 "Diamond Hollow II"){kind=icon}
 "Tyrant"){kind=icon}
 "Dragon's Call"){kind=icon}
 "Liquid Measure 2"){kind=icon}
 "Demons Took My Daughter"){kind=icon}
 "Fantasy Online"){kind=icon}
 "Mass Mayhem"){kind=icon}
 "Creative Kill Chamber"){kind=icon}
 "Five Minutes to Kill (Yourself)"){kind=icon}
 "Microbe Kombat"){kind=icon}
 "Max Mesiria Chp2 RPG"){kind=icon}
 "The Space Game: Missions"){kind=icon}
 "The Next Floor"){kind=icon}
 "Crush The Castle 2"){kind=icon}
 "Epic Coaster"){kind=icon}
 "Castaway"){kind=icon}
 "Robot Wants Puppy"){kind=icon}