Let me add in more details about how Kappa/Gargoyle boss fight I'm planning to do.
Kappa boss fight is more taken from Sekiro. It's going to be a little creepy and Kappa will disappear under water only to pounce on her from behind. It will have special sex animation for that grab. It can't be escaped from. Once it happens twice it will cause a game over.
Gargoyle will not have two animation but it will be flying enemy.