DinoSystem is an ecosystem simulator but contains a top-down, hardcore survival game.
It is single player and fairly cheap.
You are a nude human on an island with some dinosaurs-- but honestly in most cases the environment itself is more dangerous than the dinos. You can construct tools, weapons, crude structures, but you are a hunter-gatherer and cannot farm. So you need to get out there and find fruit to eat and meat to kill.
It is… very difficult. One mistake can lead to a snowball effect that kills you now, or might not kill you until a few days later. Very trial-and-error.
Depending on your diet and activity, your character can get fatter or bulkier with muscles. Or both. You can actually START the game heavier, but you won’t get as many points to put towards skills. I prefer to start of as a smaller, more experienced guy and use my skills to thrive, until the point where I’m hunting Tyrannosaurs and growing THICC off their delicious meat.
If you eat or drink too much you’ll gain a ‘bloated!’ status effect, there’s no visual for it but your character will belch on occasion and won’t be able to run or jump while overstuffed. Also the bigger and heavier you get, the slower you’ll move, and the lower you’ll jump, BUT you’ll stay warmer and stagger less when hit and take more damage.
aaaand apparently the most recent update introduced the option to play as a female.
link to Steam page: https://store.steampowered.com/app/373750/DinoSystem/