godot/demos/viewport/2d_in_3d/engine.cfg

[application]

name="Pong 2D in 3D"
main_scene="res://pong3d.scn"
icon="res://icon.png"

[display]

width=640
height=400
stretch_2d=true

[input]

left_move_up=[key(A)]
left_move_down=[key(Z)]
right_move_up=[key(Up)]
right_move_down=[key(Down)]

[render]

default_clear_color=#ff000000