A mech game, the hand-drawn portraits definitely give it a unique look.
My main criticism would be that, for a game that's early in development, there are a lot of extraneous elements around. I believe you'll get the most bang for your buck early on by focusing on stuff that the player is going to interact with constantly.
Perhaps fleshing out the cockpit would be a good first step since it's present at all times. The blobbo dashboard ornament is cute and I like how it shakes around when you do a sidestep but you could do a lot more with the space you have. As an example, the enemy radar and compass could probably fit in there, and the elements in the center of the HUD are just for show from the looks of it. In Hawken the fuel gauge is essentially a stamina bar if I remember correctly.
Anyway, that's just my idea. UI design sucks but you gotta do it. Keep up the good work.