What exactly do you mean by "big"?
As far as game size goes, it has four large "areas" separated into floors of the house. Game time will vary, but for me, I think my first time through was about 8 hours, and now it takes about 6. After you beat it, you can play again at a sort of "harder" setting, where you will receive twice as much damage when you're hit, but will also cause twice as much damage, allowing you to get a higher score.