Actually Flashback has nothing to do with Out of this World (Another World) aside of the fact that it was written by the same guy.
There was to be a Flashback 3 (nevermind Fade to Black) for the GBA, but it never got completed, though you can see early demos of it on Youtube.com
Another great game by the same programmer is called Heart of Darkness though of course that only released for the Sony Paystation and Winblows. :/