The biomes are going to be as diverse as I can get them, I can't say much though without spoiling stuff unfortunately :(
Nothing is procedurally generated. I considered it (for a long time), but it can get messy if you've scanned everything in the areas you are able to travel to with given equipment, but still don't have enough to unlock a crucial upgrade to get to a different area. I'd rather just design a metroidvania-like world myself, which also happens to be something I've never done before so it'll be a learning experience too :P