Ah, the kotatsu, the most important piece of Japanese furniture, awesome!
The only other thing I could think to add, although I have no idea how you'd do it in pixel art, is one of those small Japanese household shrines to honor the dead.. a butsudan shrine, I think it's called? It is a common fixture in both anime and j-drama and so I think it would suit the theme quite well!
One more idea.. perhaps a incense burner with animated smoke? That's all I can come up with, this looks amazing already!