Taito‘s American division developed this vertical screen base defence game in 1981. Colony 7 owes quite a bit to Missile Command, if the truth be known, and was also probably the very first video game to feature “rip-off” micro-transactions too…
Psytron is an early shoot ’em up released for the ZX Spectrum by Beyond Software, who published it in 1984.
It’s a futuristic “base defence” game in essence, with you playing through six different levels trying to fend off alien invaders on a 10-screen landscape – the “Betula 5 Installation”.
Atari‘s 1980 arcade hit, Missile Command, is a frenetic and chilling race to destroy nuclear warheads raining down on your cities.