Is it possible to take away the visibility of leaderboards, health, inventory, etc? I have no idea how to do this, I'm guessing it'd go into the PlayerGui, but not sure what the script would even look like.
Use this line in a normal script inside a client-side location, so place it in the StarterGui as it will run as soon as possible after the player enters the game:
game.StarterGui:SetCoreGuiEnabled(#, false) -- Change # to the enum number
List here: CoreGuiType (Enum)