As a person over thirty I understood in about 30 seconds that the original Basilisk is presented under the literary conceit of being an unfinished SNES game and Basilisk 2000 by the same developer is presented as an unfinished game on an unknown platform somewhere around 2000.
I don't mind any inexactness in the game premise, but if we want to get pedantic this would have to be a PC game, not a console game..
The other comments here are a little too focused on the looks. Okay, let's go over that. The PS2 launched in 2000 and the Dreamcast was already out. Games on those consoles would look notably "better" than this. The consoles beforehand would look a little worse, unless they used lots of pre-rendered assets (as was the craze at the time), which would require fixed camera angles if used for the environment.
But the problem isn't the graphics. Or well, not how good they look. It's the fact this game's genre was synonymous with the PC in the 90s to early 2000s.
- Daggerfall, 1996, MS-DOS only
- Diablo II, 2000, PC only
- Baldur's Gate II, 2000, PC only
Some of these games were just too damn big. Diablo II was 2GB and Baldur's Gate II was 3GB. The latter would've needed at least 5 PS1 discs, more if we consider that some things have to be copied to every disc, and since the game is not as linear as FF7 (1997) or Chrono Cross (1999), both of which had 3 discs, there's no way to sort what goes on what disc to minimize the switching.
But Daggerfall (1996) was less than 200MB, which would have fit on a single PS1 disc. It was still a PC exclusive. I believe the real reason is that western-style RPGs gradually evolved from text adventures like Colossal Cave Adventure (1976) and fully retained their strong PC association all the way to the 2000s. And I believe the primary reason that this association changed is because Microsoft entered the console market in 2001. Morrowind was available on Windows and Xbox. Everything available on Windows was on Xbox. And this encouraged the other console developers to better support and encourage games formerly limited to the PC.
Finally, since the game "was not finished", these are not the final assets. So we can't be sure how the game would have looked when it was done. It was very common at the time to push back or remake a game in development for a new upcoming console. So even if this had been originally slated for PS1, if development had continued this would likely have switched to PS2 and looked a lot different anyway. Or, more likely, it would've been on Windows and Xbox.