I think the title of this little game is Black Hole. Here are the features I remember:
- The play area is a grid that slopes down to a hole in the middle that represents the gravity well.
- The mother ship orbits the hole.
- You control a smaller ship that can dock with the mother ship.
- You move the joystick to thrust in that direction.
- You move the joystick while pressing the button to fire a torpedo in that direction.
- An asteroid periodically enters the screen.
- The object is to destroy the asteroids before they collide with the mother ship.
- The gravity well influences everything. You have to take orbital dynamics into account to plan your torpedo trajectories.
- You have to dock to replenish fuel and torpedoes.
- To dock, you have to match the mother ship’s orbit very closely or else you’ll hit it too hard and destroy it.
- You can die by colliding with an asteroid, by running into one of your own torpedoes, by hitting the mother ship too fast, and by venturing too deep into the gravity well.
- The game supports red-blue anaglyph 3D graphics.