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For those wondering how different this game is from the forest, here's a perspective from someone who owns both games.
The main difference is that green hell isn't a power fantasy like the forest. In the forest you can blow up mutants and cannibals with molotovs and bombs. Or use fire arrows or flares to light enemies on fire. You can also upgrade you weapons with stuff like human teeth and bird feathers to give them a stat buff. Green hell is less combat focused. You get different tiers of tools and weapons, with stone being basic tier and metal being the best tier. That's about it, you can't blow up jaguars or natives with bombs or light them up with flares.
Green hell does have tribal native people, but they are much less of a nuisance. They don't spawn often and even if they do, they won't send waves of tribals near your location. They spawn, and if they spot you and you kill them all, it won't escalate any further like things do in the forest. There are only two main types of tribal people, archers and spearmen, no Virginia mutants or cave mutants. Again, it's less focused on combat.
Enemies in the forest are all human based. In green hell, there's more variety, you get jaguars, mountain lions, caiman and other hostile animals. And these animals don't fuck around and an unprepared encounter can easily spell death. A leaf bandage will do fine against scratches but it won't do anything against a deep jaguar laceration. It depends on if you have the knowledge to treat the laceration, better yet, kill any animals before they can even harm you. That said, it takes knowledge and skill, since you all you have are spears and bow/arrows, no molotovs or bombs.
Food and water is also much deeper in green hell. You have different nutrients such as proteins, fats and carbohydrates, so eating a piece of meat won't replenish your carbohydrates, it's less like the forest where you can likely survive off a single food source. And this mechanic isn't here just for the sake of variety, failing to satisfy any one of these nutrients can lead to reduced health and stamina, which can further affect your ability to survive.
This is a good segue into stamina. Stamina in green hell is also very important, it doesn't just affect your movement and combat. If your stamina and energy fall too low, you'll pass out on the spot. This will then lead to parasitic worms living underneath your skin, rapidly draining your sanity, which if left untreated can spell another death. So to stop yourself from passing out and getting worms, you need to sleep regularly on a bed. Stamina also dictates if you can light a fire, unlike the forest, you don't have a Bic lighter with infinite fuel, you need to start a fire with a drill firestarter, which uses a substantial amount of stamina and energy. If you don't have a fire, you can't purify and boil water, or cook any raw meat you have. Foods in green hell expire quickly if you don't cook or eat them.
Next is the sound design. Green hell's sound design doesn't just sound good, it is also very very crucial to survival. In the jungle, there's an overgrowth of bushes and trees, so it's very easy to miss any threats that are around you, such as rattlesnakes, giant ass spiders, tribal people and Jaguars. The only reliable way to identify these threats is by the distinct sound in which they make. Hear a snake rattling? Stop moving any closer and go around the source of the sound. Hear the low growl of a jaguar inching closer? Get ready for an encounter. Hear the singing of tribal people? Crouch down and avoid alerting them. Because more times than not, you won't be able to see these threats. In the forest, you can turn off sound completely and still stay alive, but in green hell, turning off sound will get yourself killed by various threats.
Lastly, I want to talk about difficulty. So far I've built up green hell to be this hardcore survival game, whether it is 100% realistic or not is still debatable with sometimes questionable AI patterns, but in its core, green hell is a hardcore survival game. That said, it's actually very customizable in its difficulty. Don't want to get bit by snakes and spiders? You can actually turn it off, don't want to deal with tribal people? You can turn it off as well. Don't want to deal with sanity, there's another option for that as well. It's much more customizable than the forest. You can go in blind and get killed over and over again. But like any hardcore game, it can be very rewarding. If you want to challenge yourself or just want to play like an Amazonian tourist, you can customize the difficulty to your own liking.