The reason they don't release anything from it isn't so much because it was a HAL thing but because the game was such a trainwreck of game dev that it's assumed that they never really got more than the prologue fully worked out in all that time due to Duke Nukem tier feature creep, lack of understanding of 3D game dev early on and the entire game just being way too out there even for the era. If you see shots from early in development the game legit looked like Cruelty Squad with texture filtering, it took them that long to get a grip on 3D.