I've been improving upon the game I showed in my previous post on this thread. I've changed the way the lasers work (the pink laser still belongs to the player on the left, it's just that the two lasers passed through each other), I've established a system where the enemies come in waves (getting more difficult with each wave), I've made a health system, and I've also made victory and defeat screens. There are still some things I want to implement which I haven't yet, including creating some stars in the background which scroll to the left in order to make it appear as though the player's ship is progressing towards the right (basically somewhat like Galaga.) Still, I like the way some things have turned out.
(NOTE: The screenshot clipped off the left side slightly. Sorry about that.)