Use Left and Right arrow keys or A and D to move left and right. Space to shoot. Try to take down as many enemies as you can to get points. You may encounter some lag like random lasers that appear out of nowhere and damage your spaceship but it shouldn't be that much of a problem.
How are my 3D characters? Great, Good, Bad... comment bellow. It took me a week to make this. Bonus: use keys 1, 2, 3, 4, 5 to change how the spaceships and bullets look like. Use keys M and N to enable/disable music