Trainer options
F1 - Infinite Health
F2 - Infinite Blanks
F3 - Infinite Ammo
F4 - No Reload
F5 - Infinite Keys
F6 - Infinite Money

Notice:

First start game world and once health hearts appear on screen activate health cheat.
Use blanks once then activate cheat and once you use it again the blanks will be set to 5.
First pick a weapon and shoot it once then activate ammo and reload cheats.
First use keys once then activate cheat then use it again.
First buy something or pickup money once then activate money cheat then buy something again or pick up money again and you will get 999999 money.