I like it so far, but have two specific thoughts.
1. I feel like it being a game over if you're checking for the husband when he comes in is a bit harsh? I think a suspicion meter could work well with that, where you have a few chances for him to come in whilst you peek behind a door and be confused, but not immediately assume you're fucking.
2. Having it be a random number of choices you have before he comes back rather than a set pattern would be nice. But I'm guessing since this something you have planned.