You know what it is, your main character is awesome and your game's other art is awesome but they don't go together very well. I think this mostly has to do with the dark outlines on the frog. Nothing else seems to have dark outlines and it seems like they're in 2 different games. Maybe if you lightened the frog's outlines up some it might help. Of course if nobody else thinks so then don't change anything if you don't want that's just some small feedback upon seeing this for the first time just now.