Space Invaders is an arcade video game released in 1978. Taito released it for the Famicom in 1985 (Japan only).
Enter - start (pause);
Arrows - move;
Z or X - shoot; Esc = exit fullscreen;
You can change keyboard settings, save (F5) and load (F8) the game.
Put your mouse over the game and choose your settings, you can also play the game in fullscreen.