The latest current public version is 0.18.4.
If you got 0.18.5 you’re either a supporter (and I don’t know what you’re doing here) or you pirated the game…
But I’ll answer anyway.
This game gets weekly updates and they’re by one guy (TheArcadean).
Every update is relatively small because of that. The new content is written in the patch notes.
You still can’t access the nexus yet. But you can leave the house, you were able to do that for a while now. You need to talk to Jessica if I remember correctly (check the leads, I think they give more info).