Little Inferno is one of my favorite things this year, and most people who are like "it's just a toy" and "it's just a physics sandbox" don't actually understand what it is. So, umm, if that's how you view it, you're not actually paying attention. It's not a toy anymore than Telltale's The Walking Dead games are, though if we're going in comparison to those episodes, then yes, maybe it is a little bit too expensive. I still feel totally justified in my $15 purchase, though.
I'll echo the "your loss" to infinity.
If you do understand what the game is (a crazy puzzle game with a weird, intriguing story and dour setting) and it still doesn't interest you, then I can't pretend to totally understand it, but I'll try.