I had an idea of adding mic input so the neighbor could hear you when you talk. Not an original idea but as far as I know, it's new to HN.

The neighbor will be able to hear footsteps if you run, encouraging a more stealth gameplay style and punishing you if you rush.

There will be multiple ways to get in and out of the house. Some more punishing than others. If a door has a paint can above it, the player will be stunned. Imagine this as a mix of the beartrap and a tomato. It will blur your vision, temporarily slow you, and cause you to leave footprints so the neighbor can find you easier.

These are just suggestions, let me know what you think.