Putting a bugfix release behind a paywall what a scumbag move
Not really a scumbag move, he made the game, he can set the rules, if that desperate then should just pay those 3 dollar.
Or simply wait, doesn't kill you waiting that small amount of time.
A tactic that encourages people to donate their money, so he can continue making the game.
Dude has to earn that somehow, and make those that donate feel at least a little bit special, keeps them paying, if everyone get same treatment, some would stop donating, since no point in it. People love feeling special