there should be targets to shoot at place to go bosses to defeat upgrades for the cannon and a lot of other things that you can choose to make the game a little more exciting. please consider this comment.
you can beat Madagascar by:
-----------
* Get rid of fever.
* Invest in cold heat and moisture. Once you are leveled up, then invest
in water and air. Depending on your location, I have gotten away with just
using water.
* Wait. Once all countries are infected, (Madagascar is rough) then invest in
sickness.