Welcome space travler. A friendly reminder: You only get one life.
Introducing the 48 hour MMO. You said it was a bad idea, and from the start and in retrospect, it probably was. Regardless, it's an MMO, it's free, and it's technically in 3D, as requested.
Coincidentally, this game is the first publicly released MMO make with the LÖVE framework.
Build for 10 seconds and then fight off the attackers with your friends!
Defend your space station in this free-form tower defense game with up to five players! Use the money you accumulate to build more defenses, but be quick; you only have 10 seconds until the next wave!