Something that would be interesting for this game is as it progresses I'd love the ability for the lights to switch off similar to how it does in Keep Talking and Nobody Explodes. Being forced to keep track of your items and their respective locations in case the lights switch off and you can't see what item is where would be a very interesting addition.
So far I"m loving this game though. I saw someone else's mention of how amazing multiplayer would be for this and I could agree, but I know how hard it is to add multiplayer to games for steam ports one day. Amazing job so far and I cannot wait to see how it progresses.