Pretty cool. A bit like Outer Wilds. Hard to tell when you've finished it, though.
Hey, happy that you like it! Outer Wilds is definitely a huge inspiration, love that game.
You make a good point though. I will add some way to indicate unvisited points of interest, so you will know when you have seen everything. Still thinking about how to integrate this lore-wise though. Let me know if you have ideas :)
And be sure to check back later, I'm adding new features all the time.