Basically plays like the original Space Invaders only with much more varied enemies and attack patterns, destroy a UFO that flies by on the top of the screen will give you a shield powerup, a faster attack, or a special weapon. Some levels end with what is usually a fairly simple boss fight. You choose between two stages at the start and that leads to two additional choices with paths going to the left, right, or center until you reach the end. Funny protect the cows bonus stages. Kind of dull now, short, and doesn't do too much to change anything up from the base game. Powerups can basically just wipe all the enemies out if you get them and if you miss you are very likely to get hit.

Screenshots: https://twitter.com/Legolas_Katarn/status/1467738851409940483