Movement: Right & Left Arrow Key
I lowered the Zombie HP by a lot. So it's much easier now.
Slaughter waves of zombies in this massacre. Use your SCORE to buy ammo, upgrades and health.
Press SPACE to skip Tutorial (Not the Disclaimer).
There is a total of 5 enemies and 26 Levels/Waves. I doubt anyone will ever manage to get so far, but give it a try.
CAUTION: Waves will be longer when you buy more.
If the sound gets outsynched, lower the quality.