From the land targets to protect, the way the screen points in the direction you are facing, and the minimap on the bottom of the screen, this surely is activision-flavored defender. It's certainly less chaotic than actual defender, the controls are a bit more sensical and the game isn't nearly as fueled with a hatred desire to kill your ship as quickly and mercilessly as possible. You have to protect some trucks driving along the ground and there are these planes and helicopters that zip around back and forth shooting these bullets that split vertically to either catch you off guard and kill you or to hit the trucks on the ground. The further you go, the faster it gets, there's not much really else to it. Hell, even the manuals challenge to get in the commando club was pretty trivially easy, as it just asks of you to get 10k points specifically on the easy difficulty (how would they know what difficulty you are on?) 10k is the point threshold to get an extra life so it's really not a high number to strive towards, I was able to crack twice that in only like 10 minutes of learning how the game works. It's an overall solid but pretty literally derivative atari game. This did come out at the same year as the 2600 port of defender, so my best guess was this was an attempt by activision to give defender fans an alternative to buying the atari-developed version.