When you just have to stomp a city to the ground, but only have about $25 and some leftover pocky to do it with, you make due! Reigo: King of the Sea Monsters did the best it could with what little they had to work with. Raiga: God of the Monsters, follows up that story by changing tone drastically and proudly declaring that if people are gonna laugh (blog post) at the movie anyway, they might as well make it a comedy.
Source: Raiga God of the Monsters Movie Review - Decker Shado