Oof, shame the Amiga version isn't included somehow. I didn't even know a dos version existed until today. I might pick it up to have the legal copy, but might keep the Amiga version I have in my emulator, because at least in the one video I looked up of the dos version, a comment said that the dos version plays worse than the Amiga original. Of course that could be just someone saying that to slam the dos version, I don't know.
Just bought Moonstone here on GOG, as I used to play it a lot back in the days on the Amiga. Must say that I find the Amiga version better than the one for DOS. A bit disappointed about missing music and sound effects, but the gameplay has been more or less as I remember it (have not played it for long, so can't say 100%) so far. :-) It's on sale now with a 50% discount btw.