...then ported to MS-DOS, Acorn Archimedes, Sega Mega Drive/Genesis and Super Nintendo in 1993.
Here the Amiga Joker with the review of the Amiga version : http://amr.abime.net/issue_1578_reviews
It's from january 1993, which mean it must be finished (even if not released
) in 1992. I'm pretty sure Flashback is genuine Amiga