It's certainly an informal thing, and in my experience, yes, a youth thing. For me, capitalization/no capitalization is akin to the difference between a formal/

It's certainly an informal thing, and in my experience, yes, a youth thing. For me, capitalization/no capitalization is akin to the difference between a formal/informal 'you' in other languages (i.e., German, French). There's nothing wrong with either in the right context. A fun little software toy seems informal enough to me, so I wouldn't question it too much.