Make what you will of this, but my first gut reaction seeing the screenshots (before even reading the text!) was “Oh this feels Earthbound-y”. Given that the Mother series is known to have a lot of humor and oddities, I think that’s a good thing for your game’s aesthetic.
Beyond that, the art is serviceable. I think the best thing you can do to sell the vibe is to keep putting in fun little elements to your maps, like that sign with a cow painted on it and the peeing statue (Is the pose on that a reference to Calvin and Hobbes? If so, well played).