The goal is to get to the end of the level alive, stealing and blowing up ships scores you points.
-Arrows to move and jump, or to pilote your ship
-Z/W to enter or exit a ship (use Z for qwerty, W for azerty)
-X to shoot (when in a ship)
How to take over a ship:
-jump on it
-press Z/W
-do the displayed combo (before the ship flies out of the screen)
important tip!:
keep X pressed when exitting a ship, and it will keep shooting afterwards (same counts for the arrow keys, but that?s less usefull).
That way you can have a bunch of ships at the same time shooting at the enemy.