…..ha—haha—haaa.Maybe only the fact that he wasn’t subliminal enough when he was stripped of his powers and imprisoned.Regret isn’t something exceptionally common for demons.He may have once, before he was God, but the power got to his head.  If anything, he regretted temporarily what he was, a lot like Death.  Just the concept of being created to do wrong is a heavy weight for someone who actually feels the concept of remorse.However, he’s long since forgotten those regrets.