No ending?
So i have no idea if I saved the world or not, he is sitting on a bench with his kid, I think he came up with a cure... maybe? I Think you should make the final result more clear. Either I failed or not I really don't care about a replay button but I would like to know if I accomplished anything after spending however long playing it... The sound is nice, the graphics are nice to look at, the game play is a little simple though so I think a 7 is fair.
you should really post what is considered a fail or a win in your comments if it isn't in the game since it is so unclear