I've been trying to write a game about Christmas movies for bloody years - I find them fascinating.
Turns out the best way to do it was to treat Hallmark's relentless heteronormatism and reinforcement of Christian, patriarchal norms as a sort of cosmic horror akin to your Cthulhus and your Kings in Yellow, and go from there. So it's a survival horror game, and it's a body horror game, and odds are you won't make it unless you fall in love and embrace the true magic of Christmas.