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
Arrow keys - move
Ctrl - shoot
Alt - absorb (and shoot) enemy fire
z/x - decrease/increase ship speed
Or use a gamepad.
If you have a less speedy computer there is also Zero Point Lite, which is the same but with almost 11MB less of background graphics and sound, for faster loading times and performance.