Problem is, the arms would be waaay to thin if he transformed from what you have, there. I'd suggest going back to your references, and looking carefully at the shapes.
The thickness of the handle isn't uniform all along (ie the vertical parts are thicker than the horizontal bar). There doesn't seem to be any texture information besides just flat colours. I'm guessing you were going for a cartoony look though, and a lot of art in games does get away with just using flat colors for stuff,…