Good game!
It was hard to understand the logic of the game, I just keep charging robots till a new door opens...I don't really get how I was losing hp but I think it was for being too close to the robots when trying to recharge them.
As you said on other reply it would be good to add a tutorial or at least update the game description to add some more details about the gameplay.
Aside from that it was nice and you got a playable game overall! Keep it up! ;D