Regarding the theme and the story, what i can tell you is that everything is not what it seems (sadly I can't tell you more without ruining the end sorry lol). If you want you can restart from the last level (click continue in the menu to continue from the last level you played)
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It's a good thing you made a save :) so I redid the last level to see the end. I was kinda expecting it for the mother, it reminds me of Hitchcock's psychosis. But I didn't expect the knife :p Well done for this nice/bad ending !
I would have made the levels shorter. A lot of people couldn't appreciate the ending I think.