The best unit is dragonfly, followed by Z-10, followed Augusta... you get my drift. At later levels, the helis are merely screening for your base so the faster you replace them the better. Your ultimate gun creates windows of opportunity where your own helis can fire at the enemy base, and you do not want to wait for the spawn time of a comanche during those precious few seconds. Add to this the fact that lower tech helis are more efficient (in terms of power/cost) and it becomes a waste to actually spawn the better helis.
As others have mentioned, ninjas need a new mechanic or some way to deal with them (traps that slow maybe?). Currently you need to get lucky with a crypt tower and hope the ninja spends the cloaked time feared or frozen to have a chance of killing it.
On that note, the crypt towers and the undead skill tree are way better than the others. A passive %25 chance to freeze to all towers, and boosting the fear chance of crypt towers is extremely effective. Paladins are supposed to counter the fear/freeze effect, but since the undead towers are extremely good at burst damage, paladins die before they can do any harm. The only reason I had any difficulty with any level at all was because I had placed many points into the orc tree in the beginning.
The game has 50 levels.
50.
Most of your time in those levels is spent firing at the same spot (where they spawn) since after you get an automatic weapon everything dies.
Extremely good game, 5/5.
Defending gets easy when you switch to moonbase and flamethrowers.
Doing as much damage as you can to South America to increase global mission success is good thing (provided you support it with propaganda).
Upgrading your mana pool is actually a disadvantage (a really big one). Needs fix.
Other than that the game is fine, except for the last level where you wait a bit too long for the enemies to finish.
I got the 15 points badge by starting a new game, right clicking and selecting play. Please fix this if it's still there.
Btw I'm not sure if this game is barge/card material.
Impossible badge:
-Pick virus
-Restart until you start in New Zealand, Greenland, Australia or Canada
-Sell all symptoms except sneezing, buy cold/heat/moist resist lvl 1, buy sneezing if you don't have it.
-Restart until the disease manages to spread everywhere before Madagascar SHUTS DOWN EVERYTHING.
-Buy full drug resistance.
-Make lethal.
I think this is a good sequel and a good game, it takes a few tries and some strategy to understand it and be successful but that's good. I was annoyed with the fact that diseases that have no symptoms caused panic attacks after a certain time (infections? time?), but it is logical if you think about it. Even if the disease has no symptoms, it would trigger the immune response in a human body, and that would show up as increased white blood cells in the blood-work. Quite logical that a country would start panicking when half their population had increased white cell counts for no reason (this could be a disease with an incubation period of 2 years, they wouldn't wait 2 years to stop its spread).
Wiped out mankind, score was 77k. Started out as a virus in Mexico with fever and heat resistance. Got myself cold resistance, airborne and waterborne then left the game run. The world started panicking, every place except North Africa got infected, bought heat resistance 2 and immediately after North Africa was infected. After that I started buying lethal symptoms as I could afford them, when vaccine showed up I bought drug resistance (not before). Hope this helps other people.
Really good ideas, but not a good card game. The lack of draw is a deviance from card games and feels weird. Switching/intercept feels far too important (shouldn't be). Hit/miss/critical chances introduce an element of luck unlike the kind you'd get from drawing cards, it doesn't feel right (and seems too decisive of the outcome). There should be more ways of earning cards, and the ability to choose which card you get.
 "Heliguardian War"){kind=icon}
 "Cursed Treasure: Don't Touch My Gems!"){kind=icon}
 "Zombie Slaughter"){kind=icon}
 "Mastermind: World Conquerer"){kind=icon}
 "Kingdom of The Wind"){kind=icon}
 "Protector: Reclaiming the Throne"){kind=icon}
 "Age of War"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Kongai"){kind=icon}
 "Barber Shop"){kind=icon}
 "Doeo"){kind=icon}
 "Nodes"){kind=icon}
 "Sonny"){kind=icon}