I didn't do too much, especially since this is a pretty small set. I added engine pieces, hover pieces to the outrigger things. I made the control stalk more interesting.
Apparently I put the wrong martian on the mini-mech worker, that one is suppose to go on this set, the one on the worker is all orange. So I'm going to say the same martian right now is piloting both, that being Atik. I think what happened is on the website I was getting information from, when you click on the link for the minifig it shows this guy as the main fig, with the unidentified martians from the other two sets being alternates, meanwhile I think they are three different unidentified martians.