Instructions in the game. The spaceship will wrap (if it goes outside the screen on the top, it will appear on the bottom. This also works for left and right. An advantage of this is that you are never cornered). The icons in the corner are how many lives you have. If you press down arrow, you go into Hyperspace, meaning you teleport to a random place on the screen. The risk of this is that you could teleport into an asteroid. A UFO will come eventually, so try to shoot it but also avoid it and it's bullets.
Thanks to Lyle Rains, Ed Logg, and Dominic Walsh for the original arcade/ 2600 game. This is a recreation of that original game. The goal of this game is to shoot all the asteroids, but also avoid them.