First, check out the README.
This project was written in 1999 in VRML for Cosmo Player plugin for Netscape Navigator. Since Cosmo Player no longer exists for modern systems, and VRML was replaced by X3D, you need to search for a player which still supports rendering it.
One such player on Windows is:
Many other players and information can be found here:
Here are some screenshots of what the game looked like back in 1999: