First of all, I almost got blind for the theme of your editor. :v And second, I also thought of a grim reaper at first but I didn't come up with good ideas for it so I went with crops. Keep it up
Hi, Mike! You need to instantiate the scene first and then add it to the tree. It should be something like:
func spawn_ghost():
var ghost_instance = ghost.instantiate()
add_child(ghost_instance)
Also, note that you're using add_child($"."), and the dot notation is used to reference the node attached to the script, it's like 'self'. In this case, the dot is making reference to de node with ghosts_spawn.gd attached to it.
That helps, but with the amount of time left and my limited knowledge of Godot I decided to leave the Jam already. I have more to learn but who knows, I might join the next Godot Wild Jam.
