I don’t think there are any hard counters. Anything can attack anything else! Except the bobwire, I suppose. Bobwire only attacks things that walk into it.
But you’ve definitely got a legitimate concern. If it’s any consolation, the devs have been running competitions among their community as far back as, gosh, a year ago? It seems like that long. When they first announced it, they were putting up videos of tournaments. I don’t think it’s e-sports caliber or anything, but they’ve definitely been banging on the balance for a while. And you can see everything in the replay mode to see how things measure up.
Also, I think we’re burying the lede. The unique selling point is that it’s a competitive RTS that plays in five minutes. Seriously. Five minutes. Maybe eight minutes if it turns into a long drawn-out slog to see who starves first.