He actually closes his mouth often in Wario Land 3 and 4 as an idle animation.
Falcon Punch is the result of the Sun heating fists. It drives the Blue Falcon. Heating causes destruction of water into the pain, where it then hurts, creating rain. Rain creates flowing water in tears, which can then be converted into other forms through more pain.
Yes, I am aware that I have about 6 or so fangame projects currently in development at the same time. And yes, I am also aware that all of this is very ambitious.
+ List of projects I'm helping out with in some small capacity during my hiatus: