The Attack (video game)

The Attack is a multidirectional shooter written by Tom Pettingill for the Texas Instruments TI-99/4A home computer and published by Texas Instruments in 1981. The game was originally developed at Milton Bradley as "Alien", based on the 1979 movie of the same name. 
Gameplay.
The player in a spaceship use their weapons to blast apart "spores" that connect together to form new aliens, and blast already formed aliens before they eat the player. There are incubators on screen that will release more spores or, in later levels, aliens.