Just move the moon a little he said! Hundreds of off-centre variables later - my final beta release is here! All being well, this will work for everyone. Then I can do a readme and thank helpers and upload to my website!
Pretty happy with the background - very close to the 16 colour one using only 8 colours but creating extra colours down the screen using the copper i.e the white stars are actually the same colour index as the orange moon colour. Another first for one of my games.
Also added the upside down Y and cheeky invader who nips in and corrects it!
Anyway, please play and post any comments/issues.
https://eab.abime.net/zone/Space%20Invaders.adf