So definitely not an fps, and it’s currently in EA, but Ostranauts is a top down immersive space sim where you salvage derelicts for parts and can build your own ship. Made by the devs of Neo scavenger. Absolutely love it, and it definitely ticks a lot of those boxes.
∆V is absolutely fantastic! It just got 1.0 a couple weeks back and the dev is super down to earth, hope people check this out and it becomes a bigger hit.