An Atari TurboBASIC XL entry to the 2017 10-Liner Game Competition - an adaptation of Tomohiro Nishikado's 1976 Interceptor coin op by Taito.
Download the ATR file and play on your favorite 800XL emulator (e.g., Altirra). The game will autorun.
See my writeup and video explanation.
Interceptor requires one joystick to play. Manuever the enemy planes into your target and press fire. You have 120 seconds to score as many hits as possible.