Cool concept. I find the art to be very expressive.
I think that the game gets tiresome after a while because you can only wait while a family member is around. They accomplish being annoying but they are also annoying me in real life. I'd rather have shorter, more frequent interruptions instead.
Sadly, I couldn't finish the game because after a while, in true sphinx fashion, she gets perpetually depressed no matter how many riddles I solve and dies. You could say this is a skill sphinx issue, but I'm not sure what else I can do to kill the rest of the family.
Keep up the good work.