It's a low-rent RTS/capture the flag/zoning game.
After doing the tutorials and starting a real game, the quickest thing that stood out, is there's no standard resource gathering. You start with set gold, and you gain more by turning builder units into towers, that just instantly give a set amount of gold. But towers must be so far away from each other and maps are small, so there's a fight for territory constantly. You could also turn those builders into spell towers, which are global use, but with a long-cooldown, and every one is pretty damn strong.
So the building itself is quite novel, but then army mechanics are pretty light. There's no tech tree, and no fog of war. Just watch what the other guy's doing, and make counters. All small army/lone unit stuff.
If a unit dies, you get back all the gold from it, and can build a new one at your base within 3 seconds.
I'd have to play more to get a broader sense of tactics, but it's just really different from most RTS games out there.