Thanks, glad that there was something useful in there. It always hurts me to lose game progress.
All things considered, it's very easy to die in this game. First, you're out gathering resources and the next thing you know is that you're low on air and it's getting dark. Then the power goes out. Do I hope and run blind or risk opening the map and losing a few crucial seconds of air?
The volcano would mean a new biome, more variety in the environment. Even if it was just generating rocks, it would be something new and cool to see. And maybe a plant full of sulphur growing nearby? Don't light a match..
Personally, I'm looking forward to how those "ancient ruins" would look. Damaged modules, not compatible with our own, or maybe something completely different? Could certainly explain all the scrap lying around. I mean, who said we're the first cat on the planet?
And the quest system. The weakest part of the game I see mentioned, even in some videos - not much to do after you have a base. It would be great to have an actual reason to explore the map, especially if we also had the caves.