Of all the games I've seen during this year's E3, Morphies Law [Twitter page] is the most immediately exciting - and it's not a game that's actually at E3. It's a "body morphology" first-person shooter, where the mass from enemies' limbs is transferred to your equivalent limb when you shoot them. This leads to giants doing battle with other players the size of their foot, or people with giant heads doing battle against people with giant feet. The trailer below explains it better.
So if I shoot you in the left arm, your left arm gets smaller while my left arm gets bigger. This means, as the trailer explains, that good players get larger while bad players get smaller. It also ideally means that the game is self-balancing, as larger players are easier to hit and smaller players harder.
Also every player is a Day of the Dead-inspired robot, because why not.
I'm excited by the potential in this for interesting level design, too. I always enjoyed the old Rats and Turkeyburgers maps which cast players as tiny scrappers in a world much larger than them, and I like playing Titanfall for the way its levels operate at two different scales. It looks like Morphies Law will do something similar, with you able to transfer mass between players voluntarily using friendly fire in order to reach unusual places.
Right now there's not much other information about the game, other than that it's coming to Steam Greenlight soon (maybe). I hope it does.