A fun concept; very reminiscent of good old Capture the Flag. I found myself baffled by the invisible (not yet spotted) enemy at first. Maybe have a fog-of-war type of thing so only placed units allow you to see into the map and the player.
Thank you, glad you enjoyed it and managed to figure it out without a tutorial as the game can be confusing. Fog of war is a great idea, might give the game a more legitimate feel. Happy jamming!