Step One: Watch Mary Rose Cook Live Codes Space Invaders from Front-Trends. (The second worst conference name ever?)
Step Two: Fork this gist.
Step Three: Respond to this question in your fork: What is one approach you can take from this Mary's code and implement in your project?
Take her brain... just kidding. I am going to use the game function to instantiate the game board upon window loading. Also passing everything into arrays and her collision method.
Step Four: Totally Optional: take a look at some of the other forks and comment if the spirit moves you.