Alright, here's some strategy:
1. Have a truck in front. If you have anything else up front, then attacks that deal "splash damage" and aimed at the front of the first car (such as the boss's missiles) will also hit the second car.
2. Blue cars should have Time Compressors and Red cars should have EMPs. A Truck in front should have invincibility, a truck not in front should have repair.
3. Upgrade priority should be New vehicle > New Special > Weapon upgrade > Special upgrade > Health.
4. Trucks should use lasers the moment they unlock them. Blue cars should avoid the homing missiles and stick with the rockets. Pulse wave and Minigun are both viable for the red car.
5. If you unlock a new level, just let the enemies kill you and go to the new level. Levels 1 and 2 have no end.
6. Oddly enough, EMP will work on the enemies that use EMP on you. Use all your specials at once if an enemy manages to fire an EMP.
Why the the civilians dumb enough to run right into you?
Why can the military only shoot straight in front of them?
Why is the military totally ignoring zombies and aiming at you?
Answer: The same reason the zombies are uninterested in them - they have no brains.
Reading these filthy capitalist comments makes me sick! Who needs to harm their comrades or stab them in order to win? That's not the socialist way! True way to win game for glorious motherland is via running swiftly, and taunting your comrades!
...also, using salutes, donations, and scolding to help the party officials catch your dirty cheating comrades! Why are they running faster than me when I've got every upgrade? We should all run equally!
The sacrifice system is pretty good, though I'm not sure why it can't apply to all the items. The gameplay is okay but really repetitive. The big issue here is the stats. Defense greater than enemy attack +3 does nothing, while Attack works all the way to enemy defense +80! Then again, Dexterity at 100 lets you attack 6 times per second (effectively multiplying your attack * 6) while Attack at 100 only multiplies your attack * 4, and even then only against enemies that have 20 defense or less. Leveling Life, Magic, or speed is useless.
Equipment is even more unbalanced than the stats! low defense but extra in other stats is almost always better than high defense armor because of the defense cap (the exception is if the bonus defense would make you hit the cap exactly. The highest base damage weapon is always the best no matter what, and the best accessory is the one that heals the most.
Karl Marx could fly? And clone himself?!
The streets were paved with food and drugs?
The politicians had to run races and try to out-cheat each other?
HOW DID THE SOVIET UNION FALL?!
I'm sure we all have a story about getting Madagascar, only to have another nation survive. But can you believe I saw the USA be the sole survivor?! With the possible exception of Greenland, it's the easiest nation to infect. The odds on that must be very long indeed...
Oh well. U.S.A.! U.S.A.!