Using this Trainer:

Launch the trainer first, then launch the Game and then Press F1 at the Main Menu.

Listen for "Activated".

Press desired option key

Options in Promo:

Numpad 2: No Centipedes

Options:

Numpad 1: God Mode

Numpad 2: No Centipedes

Notes

USING THIS ONLINE OR TO BREAK THE LEADERBOARDS MAY RESULT IN YOU BEING BANNED.  YOU BEEN WARNED.

Numpad 1: God Mode - toggle this on and many things cannot kill you.

Numpad 2: No Centipedes - toggle this on and the centipedes have trouble spawning.

Temporarily Disable Hotkeys:

To temporarily disable the Hotkeys, press CTRL-H after trainer is activated.  You can use CTRL-H to re-activate the Hotkeys as well.