As written in an earlier comment, my interpretation of the theme was actually that the house has all kinds of holes which the enemies can enter through (windows), that you gotta patch up in order to stop them. So in that case the theme is implemented in the core gameplay! But I get that people could be confused about it tho. But Imo a theme is just there to center creativity about and limit the infinit pool of ideas that you might have before a jam, so going a bit beyond it should be fine :)