Commands
--shift + control + P-- Object list dump on UNDERTALE's save folder. (A .txt that contains all the current active objects)

--shift + control + G-- God mode. HP refills by 1 every frame.

--shift + control + D-- Flag checker. A debug message shows up every a flag changes. (Haven't tested this one, may crash?)

--V-- Switches the visibility of all solids.

--Shift + PageDown-- Shows a little black box with all objects and their information.

--PageDown-- Activates a Mouse debug. You can select objects, and edit them with a window that will show up when you press Right click. Hover over the object you want to select! If no object is selected, the right click menu will be different.

--F3-- Opens the Fancy Room Selecter mode.

--R-- Restart the current room.

That's all (for now), enjoy!