The first step in our game will be to create our main ship, controlled by the player. Make a new GameMaker project. We're going to make this game in a little retro style, so draw two subimages for your main ship's sprite, one for forward, and one for tilting right (which we will repurpose for tilting left with image_xscale). Typically in games of this style, no extra sprite will exist for moving downward, and it will use the same one as for moving forward. The subimages should be 32 x 32, to make some things easier later on. When creating your ship, give it two guns, one on each side. An example is shown as follows:

Once you have made your ship's subimages, modify the sprite's bounding box as usual, and also make sure to center the origin (on both axes) so that we don't run into any issues with image_xscale and so that we can easily program the vertical movement, accounting for going off of the screen. After this, create the object for your main ship and assign it the...