I don't have a ton of useful feedback to give, but I do have lots of praises (lol). I guess I kind of just love everything about this game? I played the whole thing today, and the art direction is just wonderful. Apart from some slight readability issues when things get heated, you've definitely nailed something special here, and of course the lovable characters breathe even more life into it, (pretty please add more of them xD). The only thing that comes to mind as I'm sure you've thought of already is filling the void out of bounds with some terrain to make it nice and seamless. There are even already little bits of worldbuilding in place, so seeing where that goes will be neat. All this plus the moody soundtrack make it feel deceivingly complete.
Playing the game, the first thing I notice is that you've got a pretty clear idea of what you want it to be; it's confident in itself. It lacks content in its current state of course, but it's obvious you've got a lot of that sorted out ahead of time, with what looks to be the foundations for a campaign mode and a story line. I saw there was footage on your twitter showing off ATGMs and APS, massive W and a clear next addition.
I would like to mention some difficulties with planning maneuvers around vehicles in a formation that have different speeds, and it might be worth looking into a way to order vehicles to move together at the pace of the slowest in the group.
Very cool game, very promising, I would support this any way I can in a heartbeat.