I don't know if this is where you want bugs, Yahtz, but here goes.
So I just reached Zagu Prime and it's frozen-ish. I was in looking at the system map as I reached it and it looks like it's closed the map down to a blue vertical bar, but now it's stuck. I say ish, because as I typed this my engine just exploded and the alarm is now sounding in my ear.
I'll restart and see if I can recreate it.
EDIT: Confirmed, did it a second time. Looking at the system map as you reach the planet soft locks.
PS. Not to gush, but I'm a big fan of your work, and I think I'm going to love this game. And if bug hunting helps, then I'm gonna bug hunt the shit outa this.