Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Infinite Health
NumPad2: Infinite Armor
NumPad3: Unlimited Ammo
NumPad4: Unlimited Blanks
NumPad5: Super Damage
NumPad6: Enemy Bullets Don't Hit
NumPad7: Change Money By 500
NumPad8: Change Keys By 5
NumPad9: Change Hegemoney / Meta Currency By 50
NumPad0: Reveal All Rooms
NumPad/: No Reload
NumPad*: Disable Enemy Attacks
Disable Enemy Attacks: While active most enemies will not attack you.
Money / Keys: You must pick up money first. Then you can add money/keys or edit the values. Please note that it will visually updated ingame when you pick up money again.
Unlimited Blanks: While active you have unlimited blanks. Takes effect when you enter a dungeon or when you use one of your blanks.
Money Counts As Hegemoney: While active every money you pick up is counted as hegemoney.
Super Damage: While active you kill everything with a single shot.
Enemy Bullets Dont Hit: While active enemy bullets will fly through your character.
Disable Enemy Attacks: While active enemies won't attack.
Unlock more trainer options including updates from here - Enter The Gungeon Trainer