Horizontally scrolling shooters are perhaps most commonly associated with the 16-bit Japanese consoles, but there were some great ones on offer on earlier home computers.
One such example was Laser Hawk from Red Rat Software, developed by Kiwi programmer Andrew Bradfield with graphics by Harvey Kong Tin. This was an enjoyable, speedy, helicopter-based horizontal scroller with a cheeky line in fanboy-baiting — the structures you had to destroy at the end of each level all bore an uncanny resemblance to rival, non-Atari computer manufacturers’ logos!
It’s a game that I greatly enjoyed revisiting, and was very pleasantly surprised to discover still plays rather well today. Give it a shot!