I like that you tried to have a completely different take on the "only one" theme. You could argue that this is part of the gameplay of course. Though I think you would feel it more if the attacks were more aggressive like thunder strikes (although I already felt bad to kill the people in their life boats :p).
Also the problem with overpowered characters is that there are often no real challenges for them which is also true for this game.
Overall I liked it and kudos for doing the voice overs yourself :p