Great and polished game.
I like how do you implement the idea of memorize the enemies and the health of them.
I would like to have some upgrade to increase the time of the pings or something that helps to "memorize" the enemies position when there are more. But this is a deatil
(And, of course, the radar is a great idea. Everybody knows it. I don't say this because I also use a radar in my game :P )