Did anyone ever play Star Sonata? It was an online game like this and had tons of features. Unfortunately, it was not only a tiny bit buggy, but it had some things I just didn't like (like if you log out and you're moving even slightly, when you log back in, you'll have floated around for all that time with no idea which way to go or where you are). Still, it was fun, with great features (gravity, tons of missions, weapons, levels, skills, personalized "dungeon" galaxies), and the only thing that made me quit was the fact that you had to pay to get past level 20.