From that back of the Novagen 1984 UK Box:
"Follow me to a galaxy far far away where your ship is in orbit of a strange new world. You set off in a probe for the planet's surface to take a closer look. Mysterious obelisks litter the surface, clouds hover menacing over the desolate plain, when suddenly your monitoring systems tell you you're under attack. The encounter has begun!
Encounter! is a 'through-the-window' game that offers complete freedom of movement, eight different landscapes with three challenging skill levels.
With Encounter! you're part of the action - not above it! The superb three-dimensional graphics and sound effects give a real feeling of intimacy and involvement as you doge missiles and try to down alien saucers. This is high-speed combat at its most exciting."