For players that open a lot of games on a page all at once, I'd suggest adding to the gamepage that this is a duet game. So when they get to it that information is readily available. I say that because I know some players who come from outside of Itchio don't always check the tags.
Otherwise this is a very good setup, the green and black work well on the gamepage (recalls something classy but also moldy at the same time the way it creeps in on your header. Good for evoking decay). The doodles are GREAT. Very 90s indie comic or even something simple from the keenspace days. You put a LOT of heart and soul into this document and it just resounds with all the lore and character a game like this needs. I can't speak to playing it because I normally play solo games but I can definitely see a duo picking this up and really vibing with it.