Enemy attack waves

Recently, I've been working on some enemy attack waves. It's much harder than I thought to be honest. Heres a video showing a first attempt at some enemies and their attack formations. They even randomly fire lasers at you the swines. And because everyone knows that all good shoot 'em ups have power ups, here's one that gives two shots instead of one. What more do you want, three shots? Best get another power up then!