A lot of people are saying that gaming needs to "grow up". Jade Raymond said it. Some guy who wrote an article for a videogame blog said it. A taco meat-colored guy who shops at my local Gamestop said it. Everyone is saying it. Therefore, it's a thing.
To all of these folks demanding that the world of gaming to bend to their will, may I direct your eyeballs towards exhibit A. Nothing's Gonna Stop Me now is easily the most "grown up" game you've ever seen. It's based on the classic "weird naive guy and his many catch phrases" TV series Perfect Strangers, a show that was canceled back in 1993. Unless you're at least 21, you probably don't even know what I'm talking about. It doesn't get much more "grown up" than that, now does it Jade Raymond!
All grown up-ness aside, Nothing's Gonna Stop Me Now is true modern classic. Take the role of Bronson Pinchot's as Balki Bartokomous. Chase your wildest dreams, discover the dreams of others (including "go to the moon", "eat 700 pies", "not feel trapped", and "poop all night"), and eventually uncover all of the joyous secrets. It's free to play, so you have no reason not to boot it up and experience for at least 8 continuous hours immediately after reading this post.
If you're still not sold, here's a mini-review. The game is like the body of Muscle March crossed with mind of Robot Unicorn Attack. In other words, it's like God made it. It is much better than you and everything you've ever done with your life. The only way it could get any better is if it spins-off into a flash game based on Family Matters. Here's to hoping!