Hello, I just noticed that you don't get any punishment for leaving and it is really annoying when you see people leaving this ruins the gameplay for everyone.
For the cases like NK or Mafia I understand that when you die then leave a punishment is obviously not necessary, but on the other side something must be done.
Leaving or Role dodging must be penalized by the system due to the potential for abuse.
Give time penalties that prevent you from joining another game again immediately after. Those also should be increased for subsequent leaving.