I think that Desolate World is also some crack group name or other demo version. There is only one to check it - open it in winuae/real amiga.
I play that demo for some time, it is long
I still do not finish it. There are lot of interesting traps and puzzles. I have collecting some keys, fight dragon head, control few vehicle-like platforms, solve puzzle based on programing lift and generating password for door and still I do not finish it