First of all , choose different font, use webfont, (you can found it in tutorial section) ,
second, use your own button graphics, like don't use the normal buttons use a sprite button better than the plugin.
third, This not your own graphics isn't it? I always prefer to make my own graphic even if they are not stunning, but when you use different graphics from different places, you can that the game's graphics is unrelated together & can't "Mingle" into a well done environment.
Fourth, add more contents, like add more fruits: Apples, pears, bananas , kiwi, watermelon , etc.. & more insects !
Fifth, add mission or achievements so the player can get more into the game & stay to achieve it.
Hope it helps