The level design and art in this game is simply amazing for its time. I noticed this game received mediocre review (aggregate) but by todays standards the game is a lot of fun and still relevant.
If I recall correctly, the biggest problem with this game was the lack of save points. Otherwise it was a challenging platformer for its' time.
One of my favourite platformers. Even though most of the people think that the pinnacle of the series is the second or the third game, I still think that this outclasses them both because of the world. I prefer the tribal atmosphere over the more crazy cartoonish sci-fi the sequels go for.