wow ... its very nice to get up to diamond (14) and die because you are missing 1 pixel of your ear
it is very important to your health. :)
You see, that pixel was a very important pixel. Being a part of your head, it probably stored vital circuitry, and it melting could (and, apparently did) cause a system shutdown.
While, in game terms, it can feel pretty ridiculous that you were doing so well, and you die from what seems like pretty minor damage, what else do you expect the developer to do? Just how many vital components should your robot be able to lose before they shut down?
Without your ear, you would not be able to see!