Wow, another great surprise! Never expected to see this.
I remember playing it and finishing it in my Qbasic/Freebasic times.
Years later I tried to play it again but get a shrinked screen when trying to play fullscreen on modern PC. I just can't replay it today.. (I remember another one of the same time, Lynn's Legacy, also in freebasic, I either have the same problems today).
Another game that makes the GCW0 worthwhile having. Wow!