Amutere Javascript Games (Space Invaders)

I have been trying to make a space invaders game for a while now. You can have a look at the other attempts if you like. They're still there I haven't removed the old ones.  I began by trying to move HTML and CSS but it was horribly clunky and I have given up on that approach. Now I have been watching Frank's Laboratory on Youtube and I'm trying to follow his advice.