You won't have to worry about anyone destroying your buildings if you type in ironforest on the title screen.
Disable Active Cheats
Type in meatmode in the title menu and you'll cancel any other cheats that you may have activated previously.
Enemies will only appear at night if you type in vegetarianmode on the title screen.
Find an item that you want to duplicate. Hold a stick and turn it into a weak spear. Now pick up the desired item and you'll have an unlimited quantity at your disposal.
The Calm Forest (v0.0.3)
On the title screen, type in veganmode and you can play without fearing attacks from cannibals. When you save your progress and play again without that mode activated, you'll retain any items and your structures will remain in place.