How big is this game?

I just reached room 46 and hit credits on day 28, but it feels like I’ve BARELY scratched the surface of the game. There’s a ton of rooms that I haven’t seen, there are seemingly endless puzzles I can’t even begin to solve, I don’t know where to get started in the computer passwords, it feels like there’s just so much freaking game left. So without spoilers, roughly how much is left in the game if I want to keep exploring?