As mentioned before, the graphics were great for their time, but are pretty much dated now. The images look very blocky and pixeled, even at high resolution. When using a 3dfx patch, things improve a great deal, and it pretty much looks good even by today's standards. However there are occurances where you notice one of your limbs disappear into a wall, to name an example, but this is mainly due to the engine, which built the levels out of cubes. It's for this reason that most of the rock and other objects also look like they fit exactly into a box.
Sounds are basic but great.
There is hardly any music to speak of. Most of the sounds consist of the sound effects, some atmospheric sounds that fit the surroundings, like an echo type sound in caves etc. The animals all sound as they should, and since most of the sounds consist of moving objects, the sound fx guys didn't have to stretch their limits on this one. The first PC game I ever bought, and still one of my Top 5 all time favorites. This game is a true classic.