I don't like demons. They take a while to beat. And it's often very boring gameplay. But motion by Tama_N and X by TriAxis are very fun. And not hard Gameplay is the most important thing in a level. Because every level has gameplay...
Although I said when RobTop supports custom key bindings, so you can make it easier and less annoying.
I think he talked about a secret level as a joke... He said every 1 attemp (joke ofc) would cost 1 mil or u have to wait daily.. so no secret level at least not revealed... Spoiler But i think there is one , too