Toronto-based app developer Snowman has been having a delightful amount of success lately. Its endless runner (endless snowboarder?) Alto’s Adventure (2015) is a lighthearted, beautiful game that seemed to take great joy in doing backflips over towering mountains. Its popularity was as much due to the love and care given to the art as to the air tricks you could perform, and it would be reasonable to expect that a follow-up would share at least some of those traits. It’s surprising, then, that Snowman is preparing to do an about-turn towards melancholy with the new game Where Cards Fall. a “bittersweet memory…