PRION is a fan remake (or demake, or sidemake?) of the original Zarch(1987)/Virus(1988) game by David Braben.
Check it out on itch.io and maybe leave a contribution :)
Aliens are infecting Earth with a deadly disease. You have been tasked to destroy all spacecraft that pose a threat to our planet. Please act fast, as your reward is based on the amount of uninfected land in each wave of enemies. There are an estimated 10 waves of increasingly harder alien reinforcements. Reports also show that the extraterrestrials possess a device that can alter the force of gravity. We have equipped your ship with fuel and altitude gauges, a scanner, a laser cannon , and homing missiles.
Check out the full mission briefing on itch.io, or go ahead and figure it out as you go.
3D graphics were done using the freely available Zarchy Engine for pico-8: https://github.com/tpnk-dev/zarchy-engine-pico8