A few suggestions
First, the graphics could use a tune up. As somebody else had suggested, a distance counter would be nice, or perhaps some other methods of scoring points (perhaps collect some objects of some kind). I don't think that the "lives" meter was an appropriate name, because normally a life is something you lose and then start a level over with. Health would probably be a better label. All in all well done but give it a tune up and expand the game to incorporate more levels.