This is a game concept i made for the gmtk game jam over the weekend, check it out here: https://piranha305.itch.io/kingdom-battle, is this a game idea i should keep pursuing, right now in it's current version it's pretty basic, but it could be expanded on with more unit types and a multiplayer system, but i don't know if i should invest the effort? also right now the art it's using if from kenny.nl assets, but i'm im gonna roll with the idea, i'll probably get the art remade.       

Have you ever played the Obliterate Everything games?  If you haven't (and you end up deciding to expand this), it's worth checking out to see what of its mechanics would and wouldn't work for this.