First of all, love the game and I already need more of it. However, using sprites/artwork of Housamo characters might not be the best idea. I understand why you would use them as placeholders, they look great, but since they belong to a company/their artists, they shouldn't be used without permission/providing credit. I don't know if you asked or not, and I'm not accusing you of anything. I'm just worried you could get in trouble for it in the future.