Heroes are of no use as an offensive power - I got a tactician (Frostik) upgraded to lvl 6 by endlessly redoing the last level and in return it gave me an attack power of just 112... (The next lvl for him will be at 12800 exp and I see no use in doing that). But on the other hand heroes are a great help due to their passive skills (especially those that make warriors/mages of the same element more powerful). Still the game can be easily beaten without them.
a very nice idea but it could be realized better (at least it could reflect the real mechanism of getting sick...) otherwise it's much like the desktop tower defence
Hm, the game is awesome, especially from a doctor's point of view, but I can't pass even the 1st level. Isn't it too hard? (I mean it could have less challenging playing modes, just for fun...)
 "Protector III"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 2"){kind=icon}
 "Bacteria Tower Defense 1.0"){kind=icon}
 "Line Game"){kind=icon}