You really nailed the feeling of exploring an old deserted online game.
SPOILER AHEAD, STOP READING IF YOU HAVEN’T PLAYED THE GAME YET!
The ending also was amazing, and you made a very good design choice by leaving the player alone in front of an empty lobby screen, without any extra comment or dialog line. It leaves the player with LOTS of feel and questions, which is great when done right.
Well done :)