I started working on a new Z80 to 6502 conversion of Alien 8 a couple of months ago and now have a fully working version running on the C64.
Alien 8 - Full Z80 conversion for the C64 - WIPhttps://www.lemon64.com/forum/viewtopic.php?t=71412
https://twitter.com/smila007/status/1126036032598757376