I don't think you understand my point. Not many people will allow a game the use of their webcam, especially from a gamejam game that someone put together. People are very suspicious of people watching them; you would be lucky to find people who don't have their webcams disabled. All I'm saying is please don't limit your game by making it only playable with a webcam.
Another solution would be to include an in-game timer with night/day mechanics if the webcam is disabled. Also, your idea isn't practical due to the fact that it would require someone to stand up, walk over to the light switch, and turn on/off the lights each time they need to change the time of day in-game...you would be surprised how lazy some gamers are. So, it would be nice to include an alternative to completing your game. I only say this because your game looks like it has potential, and it looks like a great idea...I wouldn't wanna see it go to waste because someone doesn't have a webcam.