Nebs (1983)

Nebs is an arcade game for the Atari 8-bit computer. The player controls a small arrow, which can move in the four cardinal directions, and must shoot at and eliminate alien nebs. These enemies move unfailingly towards the player, and speed up as more of their brethren are eliminated. The player can set the number of lives they start with from 1 - 5, and can set which wave they initiate on. When all 20 nebs are eliminated, the player progresses to a more difficult challenge.