I’m still very much learning this game, (Level 2, wooo…) but rush tactics certainly work in the lower ranks.
So far, I’m finding that it requires a keen eye across the entire field. Quickly learning what units your opponents deck has and building to counter, not just reactively, but preemptively, is going to be a big part of higher tier play.
For starting out, keep an eye on the missile countdown. Controlling the missile is absolutely the priority, always. The 3rd game down (v. elberty) was hilarious. I made the genius tactical decision to run off the control pad to chase down an enemy unit as they took a lower pad. Literally gave it away and just couldn’t scramble back.