Many words can be used to describe last year’s endless snowboarding game Alto’s Adventure, but the one that stands out for me is flow. This encompassed the curves and angles of its snowdrifts, its wordless storytelling, and how smoothly it reset you to the top of its mountain once you fell. It was a game in harmony with itself, perfecting the loop that most mobile games aim to persuade their players to get caught up in, but giving you beautiful Peruvian horizons to admire rather than stooping to tiring exchanges of virtual currency and statistics. I was delighted, then, when Ryan Cash…