what's the final implication though? saitama starts to look a lot like the "god" at the end physically as well as in the way he breaks free of the fourth dimension. it's remniscient of how the gods were portrayed to forcibly transcend time and space. if killing god requires enough force to wipe out the universe then saitama essentially carried out the universal evolution through destruction as planned. he is now the god of a previous universe as described at the start, with the only thing carrying over possibly being the space-time stone in his fist before the punch, perhaps to repeat this cycle again.