I wanted to quit so many times but kept going and finally beat it. Returnal is one of the best games I've played. However, the lack of save is its downfall. I am not a "gamer", I'm a dad that has maybe 30 minutes to an hour a night to play games. In returnal that means a lot of getting nowhere but it has to be that way or you'd beat it in a few days instead of the couple months it took me. It's a great game right now bc there are so few ps5 games I didn't have anything else to play so I kept going.
Once you beat the 3rd biome the rest of the game is a breeze. Keep going, you can do it.
Oh and best way to beat biome 3 is to go through biome 2 to get more health and gear, don't try and take the shortcut. At least that's the only way I was able to finally beat it.