You're working as a house-sitter, and someone hires you to watch their house for a few days, but, something's off... You get to the house and set up a few cameras in the house to keep track. But... what's happening...? Things are... changing? Someone or something is lurking in this house... You need to get rid of it, whatever it is...
Credit to @Calithor for some of the code. Credit to pixabay.com for most of the SFX. And finally, credit to the game that inspired this: "I'm on Observation Duty"