Perpetuum is an MMO that allows you to customize your very own robot to your liking. Whether you want to be a transport robot or a combat robot, Perpetuum has you covered. The world is shaped by the players and their corporations (similar to guilds). Territories will fluctuate, robots will be lost, and people may abandon you -- only time will reveal these things.
So why don't I like Perpetuum? Perhaps it's because I spent a lot of my time walking around and harvesting minerals to turn in for robo-bucks to try and get a better robot. It's not that I don't like that type of gameplay, I fondly recall hours spent in Freelancer convoying minerals from one space system to another. The problem I had with Perpetuum is that it's just so ... esoteric.
I completed the tutorials, tinkered with my robot's gadgets, took a few missions, and came away feeling a bit empty. Perpetuum is not for me and I could tell that right from the beginning, but it could be right up your alley, and if it is, I urge you to give it a shot. For once, this is not a free-to-play game, but there is a 15-day free trial for you to jump into.