Well, I know cracked software is generally not allowed. However, since this game is by now 18 years old, the full registered edition of version 1.0b of the game is available for download all over the internet and, as far as can be determined, abandoned, I think this is a different case from your avarage shareware crack.
I've put quite some effort into contacting the original developer (Michael W. Lawrence, also called Mike Lawrence) but all trails turn out to be a dead end. So I think it is more about a tribute to the game than it is otherwise lost than it is about cheating the original developer.
As I stated before, I would not hesitate to pay the original $25 and buy the registered copy. But this option is, in absense of a contactable copyright holder, unavailable.