I really like the idea at it's core! Seeing your To-Do list show that you put some thought behind it, and the ideas all seem sensible. Two suggestions from my side - make it much clearer which defender is currently being controlled by the player. Things can get hectic really quickly, and by just color-coding it in green for example it would be much easier to figure it out, since the antenna is quite small! I'd also suggest indicating some sort of progress bar or something similar. At the moment I'm not quite sure if the game has a set goal or finish state or if it just runs endlessly. Since I always failed I assume there is an end and I'm just bad :)
But nice work overall, really liked the idea :)