This game is loads of fun. I like to take the 2nd frame (Laphis) and fly fast as I can in one direction so the enemies can't keep up with me. Then I press "Z" and activate that charge up death cannon.
If I'm feeling patient, I wait until the charge bubble thing fills up the entire game screen. Then I hit the brakes, let the enemies swarm me and fire!
Just turn to face them and watch them explode.