Infinite health.
Who says a zombie apocalypse has to stop a working girl from making a little cash? Guide Lola past hordes of undead zombie hookers to collect weapons and cash AND guide your still-living Johns back to your trailer for a little "business." Fulfill the night's quota, hop in your trailer and do it again the next night.
Arrow keys - Move Lola around
Space bar - Attack. Uses current weapon if you have one or punches and kicks if you don't.
X - Tempt nearby Johns and make them follow you.
Touching Johns - Makes them follow you.
Guide Johns back to the trailer to turn tricks. Reach the night's quota and enter the trailer to progress to the next level.
Tips:
Some areas of the environment are destructible and hide money and weapons.
You don't have to touch Johns to get them to follow you. Pressing X will get almost any John you can see on the screen to follow you as long as zombies aren't currently attacking them.
Weapons have a set amount of ammo/strength. When you use that up the weapon will disappear. You'll have to scramble for another weapon or just punch and kick your way through zombie hordes (but that's a lot harder to do).
As long as you don't completely use up all the ammo or strength of a weapon (strength/ammo greater than 0), it will recharge when you enter the trailer to go to the next level.
The machine gun is the most effective weapon in Episode 1, whereas the rifle is the best in Episode 2.