Space Invaders games are arcade games where you control a ship that goes through the screen from left to right. In parallel, enemies go down from the top of the screen and get inexorably closer to you. You must shoot them and destroy them before they come into contact with you.
If you're not fast enough, you will lose a life or health.
In the upper levels of the game, the enemies will have additional powers but also your ship, do not worry!
In games of Space Invaders, you will find retro games with simple principles, and newer games with sometimes more advanced features.