When I reseted my points skill points, it was said it costs "NAN". Then, when I reseted them to see what happens, my Gold has "NAN" too and I have no more income in the game.
I LOVE YOUR GAME ! j'aime :)
Good TD, realy cuty graphics and athmosphere. I have a but sometimes : an enemy robot is invisible. So, i cant finish the level because the robot is paralysed by the em tower but his life/health doesnt decrease. :)