) is interesting (and rather pointless).The wiki page (http://en.wikipedia.org/wiki/Racter
) on it doesn't mention the Amiga port, but it had one nonetheless. Not sure it really qualifies as a game, but it was like Eliza (an old program that would parse what you typed in and ask questions..) except, unlike Eliza, it would ramble on in a crazy way. It also used the Amiga speech synthesis, which was a novel idea at the time.
The wiki page is an interesting read. Seems there was a previous version for CP/M and they actually had it write a book. (though, probably edited down from a great deal of material)