Dev - Also, on form submission, use GD to resize the image as a new thumbnail file
Dev - In the submission form, you can now upload a banner image
Not complex, and not very good to make to computers kill each other, as they tend to spin around the enemy, that's why friction is added. I believe this would work better with a human-controlled spaceship, but it's still fun to watch them shoot each other.
No credit necessary, although if you use it in a game I'd like to know it.