If you're the kind of people that dislikes PS1 like CGI, or CGI in general, this definetly won't change your mind.
The story is pretty much non-existent, apart from this one thing in the ending that can be considered a cheap twist. Most of this 15 minute special is just action, and even that isn't all that entertaining.
Anyway, the setting is this sort of space ship that gets overrun by a virus. That's pretty much all that can be said, since they don't work on anything beyond that.
It wouldn't be as bad if the poor story was backed with eyecandy, but the CGI is pretty poor, everything looks very dated (even for the time it was released) and nothing really stands out. Most backgrounds this grey/darkgreen colour that ends up making it even more unnappealing. I know it's a space ship, it's not supposed to be all colourful, but that doesn't change the fact it's not fun to look at.
Not much to say about the sound, okay voice acting, okay sound effects, might be the most "okay" aspect of this special.
There are only 3 characters, and they are all pretty poorly fleshed out, because, as I said, it's basically 15 minutes of action without any sort of development, not that they'd have much time to do so if they wanted to, but in the end, they're still incredibly bland characters.
I guess you could enjoy it if you want a quick watch with some space action/horror with really weird alien design. Other than that, I suggest you watch something else on your plan to watch list.