PkK updated his game Colored Gravity.

There are two spaceships, each steered by a ColecoVision controller. At the top of the screen there are two numbers. The upper one is energy left. Energy is lost when firing, changing color or being hit by a missile. Energy recharges while the spaceship isn’t accelerating or decelerating. The other number is the reload. You can’t fire or change color while it’s nonzero. There are three colors. Objects of different color attract each other.

Left fire button: Fire missile of your current color.
Right fire button: Try to change color.
Joystick: Accelerate / Decelerate, turn spaceship.

Spaceships and missiles bounce when hitting the border of the playing area.

Release notes:

Here’s a slightly improved version. Missiles self-destruct after some time. This may sound like a minor change, but it improves playability by combatting the slowdown caused by too many objects being on the screen at a time.