Start a new game or load a save, open up the pause menu and select "Passwords".

Effect	Password
Kickstarter Merchant Crow + Skin, Umbra Orb, Meyef Skin!	24SR07XGBO9J
Skip the tutorial, all chests are rare chests, and all enemies that have a 2nd equipable drop will always drop that item	SPEEDRUNALPH
Skip the tutorial, capped levels, cleared Use Item Inventory	SPEEDRUNBETA