iast - 322,700 - No - ShmupMAME V4.2
I think I figured out the scoring! From what I gathered, it goes like this:
-Each enemy you hit
without missing increases some kind of bonus value by 100 (the point value that show up when you kill enemies). This includes hits landed on enemies that take multiple shots to kill, like the giant Phoenix knockoff enemies.
-Rapid shots seem to build up bonus as well, but not quite as much I think. Also being less accurate, they can be detrimental to keeping bonus up.
-Missing with a shot cuts the bonus in half.
-Hitting all enemies in a "wave" doubles the bonus amount from the final enemy in that wave. I use the term loosely because bonus can carry over to multiple enemy spawns, so you can go through 2-3 separate groups of enemies and have the double bonus trigger after killing enough groups.
I'm not sure how high the bonus can go, but I was getting 9000+ points per enemy before my run got cut by a couple of the Phoenix knockoffs that dive & shoot at you.