Glad to hear your response!
There will be more secret content in the game but not much for previous levels. Raven House is the only alternate version that will be in the game. Yes, next level will be Mason's(Mac) apartment. Phone is part of other version of this game which is just prototype at the moment. I'm planning to do Ted and Mason double teaming on Sabrina in the future but not other girls because they will not be included in Magic Ring game.
As I have said earlier, there will be different version of the game in the future with Mason.
Time travelling is more of Mason's game aspect so that game will have more secrets like the ones in the university.
Also this is based on a game called phasmophobia for PC.