Robinson's Requiem was unique in its mechanics, a survival gem, as well as incredibly frustrating. Sadly, the graphics have aged poorly.
RR comes with a survival guide, that you must read, or else you won't know make it past the mole monster in act 1, without bleeding to death. I suppose much of the frustration and confusion with the game is due to this unexplained "copy protection" mechanism.
You play as a former explorer, discarded on a hostile alien planet, and left for dead. Each of your former classmates, dumped along with you and scattered across the planet, has a portable computer. You will need to retrieve them all to find a way off this godforsaken rock. All while crafting and salvaging new gear and necessities, keep an eye on your nutrition and water, as well as fight off the cold, heat, diseases, injuries, and all sorts of wildlife. Treat wounds, find out which medicines to apply and when you run out, find medicinal herbs to replace your stock. Not to mention, that your medical tech has a limited battery life, and you can't simply go to the store to get more. Managing scarce resources is everything. And try not to lose a leg or an eye. Because you absolutely can.
The game tells you your body temperature, heart rate, etc, and you need to figure out the rest. When to make a fire, what to do when it rains, which meds and tools to use when in which order, aso--or die trying.
And that was cool! Back in 1993. Today? Not so much. The blurry 3D graphics leave you guessing half of the time what you are even looking at. The controls are tedious at best. And reading the guidebook was way more satisfying on paper than PDF.
Deus improved graphics a bit, dumbed down suvival and upped combat, but looked dated on release, and lost a lot of the original charm. It received bad reviews at the time, and rightfully so.
In short: RR is a frequently overlooked gem and milestone of survival gaming. It's hard as bones, too. But, it aged poorly. So, don't expect too much.