Theme: What's missing is your family members! Definitely fits the theme.
Fun: I really enjoyed it! There were definitely some parts that got tedious and I might well have given up if it weren't for developers in the chat helping me out. The worst thing was that often I couldn't see the effect of levers, so I had to run around and find the one thing that changed. I also loved the little bit of story with the characters.
Controls: Great! I only have a few minor complaints. I didn't realize you could switch characters by pressing numbers, so if I hadn't had that hint I would have gotten sick of using tab. Also there were some times I wished the characters walked a bit faster.
Graphics: Beautiful! The pixel art was very charming, and the vector art (I think that's the term?) for the characters in dialogue was great too.
Audio: Wonderful! I loved the music and sound effects. I also loved the use of the AudioPlayer2d so you can get an idea of where something was activated.
Accessibility: Mappable controls are great. The game is not really playable without visuals (actually, I think I'm the only one who attempted to make a game that could be playable without visuals). Showing an indicator by color only is bad for colorblindness, especially since you had red and green, which is one of the most common types of colorblindness. A simple solution would be to also have the symbols be different.
Originality: I have seen a few puzzle games where you need to use multiple character's abilities. But it's not super common. And this game definitely felt fresh and new.