Add some small flipside to levitation
Currently levitation is an awesome ability, but there's AFAIK absolutely no flipside to it. While I don't think that levitation is overpowered as it's rather rare to find when you actually need it, there could still be some thematic slight bad side to it.
For example, picking stuff up from the ground could take 1500 energy instead of 1000, because you need to crouch deeper to reach for it.