It's hard to nail down a fair refund policy for video games, beyond hardware issues, because so much comes down to taste. Steam's, which relies on playtime and purchase length, is decent, but there's an inherent flaw for shorter works that an indie dev is pointing out on Twitter, in the wake of tens of thousands of lost sales.
The game in question is Paddle Paddle Paddle, a quirky bit of friendslop in which you guide two people downstream on a raft. One person controls the paddle on one side, another on the other - or you can do both yourself, for a bit of Qwop-type shikanery.