Bro this is fantastic. I wish Armored Core leaned more in this direction, it sells the mech urban warfare fantasy so hard. Don't you dare stop developing this, I want to see it released.
At the moment I'd say readability kinda suffers, requiring LoS to lock missiles is also pretty awkward in practice, because going into enemy LoS is very dangerous so you might as well fire blind. I wonder if some kind of dash wouldn't improve the experience, so you aren't completely tied to cover 100% of the time.