A game for the Unexpanded Vic 20, Joystick required. All BASIC.

It's summer. Time for a kick-ass arcade style space game! This one has some military strategy elements, so it may be a little more complicated than a shoot 'em up.
As usual, the game works on VICE, but I feel it's much more impressive on a real VIC because of some new special effects I'm using.
Game Play:
The object of the game is to invade enemy grounds and destroy the alien Mothership.
Pilot your Galactic Warcraft into the enemy territory. Destory the guard fleet and enter the enormous Mothership. Find the core reactor. Destroy it with your photon cannon and escape before the ship explodes.
Control your ship with the joystick.
Fire Button activates your primary weapon.
Press any key to toggle your primary and secondary weapon. You start with laser cannon as primary and no secondary weapon. You may only carry two weapons at one time.
Power Ups:
Laser Cannon - destroys small enemy crafts
Photon Cannon - more powerful than lasers, limited to 5 shots
Warp Speed - increase the speed of your ship
Shield - temporary protection from enemy fire
Cloaking Device - puts your craft in stealth mode for 15 seconds
Energy Bomb - destroys all space crafts on screen
Beware of enemy ships, worm holes, and satellites.
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