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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.

You can land the ship at the base to fully refuel your craft. Additionally, you get one homing missile and a spare life every 5000 points. The following 3D scans were just sent to us by mission control and show the aspect of each alien spacecraft that is part of the invasion force:

We have been able to determine the behaviour of each enemy vessel, except for the last one, the mysterous spacecraft. Be extremely careful around it. 

Try and get a highscore of 140,338 or higher in those 10 waves, that means you're better than me. Good luck! The future of mankind is in your hands.

Controls

1. Use arrow keys to orient the ship
2. Press Z to thrust spacecraft
3. Press X to shoot laser cannon
4. Double-press X to shoot missile

Source Code and Graphics

The source code for the game can now be found on github. The 3D graphics were made with the freely available Zarchy Engine for pico-8. Go ahead and give them both a star to show support 😊

Credits

This is a fan remake (or demake, or sidemake?) of the original Zarch(1987)/Virus(1988) game by David Braben.