Commuting time is short, interrupted, and usually one-handed. Our games are built around those constraints instead of fighting them. A round of BowStack runs a couple of minutes, so being interrupted costs you a round rather than an evening. The entire game is 71 KB, so it opens before your train pulls out. And it keeps running when the signal drops in a tunnel, because everything is cached on your device after the first load.
There is no daily streak to protect, no energy meter refilling while you are not looking, and nothing queued between you and the next round. Take your phone out, play, put it away.