planes | gml

	Type	Desc
instance_create_layer(x, y, layer_to_create_in, object)	function	spawns an object at an x and y position in a given layer. Layers can appear above or below eachother, and can be adjusted in the room properties. This function can also return the instance id of the object being spawned.

Sprite	Images
sprPlayerShip
sprEnemyShip
sprPanorama
sprLazer

If you want lazers to appear middle-centre when spawned, centre the origins of the planes and lazer.

Object	Sprite	Properties
objPlayerShip	sprPlayerShip	Visible
objEnemyShip	sprEnemyShip	Visible
objLazer	sprLazer	Visible

objEnemyShip Create

//face left:
image_angle = 180;
direction = 180;
speed = 10;

objEnemyShip Step

if (x < 0){
  x = room_width;
  y = random(room_height);
}

if place_meeting(x,y,objLazer){
  instance_destroy();	
}

objPlayerShip Step

left = keyboard_check(vk_left);
right = keyboard_check(vk_right);
up = keyboard_check(vk_up);
down = keyboard_check(vk_down);
if (left) { x += -5; }
if (right) { x += 5; }
if (up) { y += -5; }
if (down) { y += 5; }

//lazer:
if keyboard_check_pressed(vk_space){
  lazer = instance_create_layer(x,y,"Instances",objLazer);
  with(lazer){
    hspeed = 20;  
  }
}

Challenges

1. Add more enemies
2. score etc