This is such a great concept for the gameplay! Having to switch between the two layers is a really good idea. I do think it got to be way too difficult though where I ended up dealing with a horde of zombies. I'm sure the difficulty would be alleviated if I played longer and memorized where the different religions were in the underworld layer. But I think maybe some additional mechanics could help with the difficulty as well like maybe a new move for Thanatos that could reap multiple enemies at once. Or a power up that could auto-sort a specific religion. Great work though!