I'm a fan of the art style! I played with the retro 16:9 view mode. To me it looks like a stylized MechWarrior 2 which is something I would consider a positive. One thing which stood out to me is the sound design. While I think the game could use more sounds in general, the weapon effects and the little feet clacks had me immersed in the cockpit which is something I would want from a game like this.
Obviously the UI is a work in progress, but I think adding tooltips would help a lot. Even for someone who's played a lot of mech games it kind of felt like being tossed into the deep end when loading the mechbay. You do at least have a help menu which is praiseworthy.
I think the only real bug I noticed was walking into an enemy unit would show their mech on my own health display which seemed kind of odd. For instant action I couldn't seem to configure it for anything besides a 1v1.