I'm kinda afraid that people are gonna ignore my explanation, and just recommend other games with Mechs, please show that I had nothing to fear.

What I like about Generation Zero is that it's a survival game that cuts out the things that I don't like about survival games. You don't have to eat or gather a lot of resources, nor do you have to repair anything. Nor do you make structures. You don't even need to make storage containers.

You also can play it solo, and it doesn't make it more of a grind, nor does it make it that much harder from what I understand. You're mostly just exploring and fighting. It also has a really helpful map. Oh, and the combat isn't tactical, nor does the game require you to do a lot of strategy.

Can you recommend anything that has at least a lot of this, and please tell me about it?

Oh, annd it'd be a nice bonus (not a requirement) if it still had a lot of adventure story elements that you experience more and more of as you go along in the game, had really great atmosphere, and has an ending. It also doesn't have to be open world.

Edit: Oh, and please don't recommend anything by EA, Acti, Ubi, or WB.