Battle Over Berlin description:

Battle your way in the skies of Berlin for aerial supremacy... How good are you at dog fighting? The objective of the game is to down as many enemy fighters as you can.. Try to get the powerups by flying low when they are available. Use 2 kinds of weapons

game instructions:

Throttle Up: Up Arrow Key Throttle Down: Down Arrow Key Pull Down: Right Arrow Key
Pull Up: Left Arrow Key    Fire Gun: < Key    Fire Bomb: > Key