This is hard, but fun.
It's hard yes, but addicting. Maybe it's because of the music. The music is great. Yes, that's one thing that kept me addicted. Another would be the gameplay style. You don't have the time limit, but you're rather fighting independent countries. The only nitpicks I have would be the difficulty, and how the HELL does an infected country send a plane to infect itself again? 0.o