QS Invaders for the ZX81

https://www.youtube.com/watch?v=gMuV8n3F2z8

#QSInvaders #ZX81 #Action #Shooter #Shootemup #FixedscreenShooter #FixedscreenShootemup #SpaceInvadersClone #SpaceInvadersRipoff #SpaceInvadersVariant #QuicksilvaLtd #Quicksilva