Now in the middle of a Kickstarter campaign, it’s basically the saddest game imaginable, a papercraft point-and-clicker with a hangdog piano soundtrack about the most doleful topic imaginable: parents who accidentally killed their kids. It’s also all really pretty and made by hand and folded from paper. There have been games that tug at the heartstring, sure. But this is desolation row. Does the abundance of depression make A Song for Viggo a hard sell? “Yeah of course, I should trash this game and make a game about cute bunnies jumping. It’s not a game for everyone. I showcased it…