itch.io

This doesn't solve the problem of players snitching at all. Those players could be aware of who was near them just before they were killed, or they could just yell out "I was just killed in Cafeteria!" and the game is still spoiled. Don't play with people who talk as ghosts.

You should join a discord server where they don't allow meta gaming. Once dead, they can't talk except among each other through text chat.

They could remove ghost chat.