As the title says, I finished the overworld tonight. 45 out of 196 rooms left to go (dungeons 4 and 5).
I don't have an updated map to show yet (I updated the engine by 1 scanline, so my new screenshots don't exactly match the old, I need to update my script that crops and adjusts them before I can get the new rooms on the graphical map).
I'm at the point now though, where every bug that gets fixed requires searching through old code to find places I can optimize a few bytes away. Fun times.