In this game, you take it in turns to take pot-shots at your opponent's spaceship. To fire a missile, click anywhere in the window. You will fire a missile from your ship towards the cursor. The further from your ship you click, the faster the missile will go. If you click too far from your ship, nothing will happen — your cursor should indicate when this will happen.
If there is a planet in your way, you can blast through it.
The other thing about the planets is that they all exert gravity on your missile. Maybe I should have mentioned that sooner.
Click anywhere to begin.