Question

How to make the curser a custom sprite?

Answer 1

http://docs.godotengine.org/en/stable/classes/class_input.html#class-input-set-custom-mouse-cursor

Comments

In a more flexible way, you can hide the cursor and set a sprite at mouse position :

Input.set_mouse_mode(Input.MOUSE_MODE_HIDDEN)
var mouse = get_viewport().get_mouse_pos()
get_node("Crosshair").set_pos(mouse)

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this seem to be a nice way, but I ran into the problem, that the sprite lags behind when going in fullscreen mode, because the game seems to update only 60 per frame (300-1000 times when in windowed mode).
Have you found a solution to that? this also is important, if I want a mouse cursor moving along the games resolution and not the screen resolution (for pixel art games)