Lol - I think Lander was a bundled demo of Zarch/Virus, or at least a technology demonstation. No sound and no enemies I believe.
From memory, Zarch on the Archie looked nicer with more colours but for some reason lacked the beefy sound effects of the Amiga Virus. Not sure why, pretty sure the machine was capable.
Personally, I used to love Chocks Away! Wasted a lot of time playing link-up games on that.
Edit: Oh and it was smoother than the Amiga version (well smoother than a 6800 anyway).