I'd love to see a sequel. I think the first game was one of those that got lower reviews because of reasons that didn't really hurt the game - of course it is nice to have longer games, but I prefer a great-to-play 10 hour game over an annoying 20 hour game.
As someone has mentioned, in a sequel they should keep the scary theme, but give you not only a mansion to explore but a bigger world, including forests and stuff.
Also, I think the game should see a sequel only because of its genre - it had a platformish feel to it, but it actually was an action-adventure. We need more games like that.