just to clear some things up since you seem to think making a game is simple, if you look in to the details of this game you can tell he have put lots of time in to it, and you don't know what's going on in his private life as well, he doesent owe you to tell what he does in private.
Making games takes time no matter if he said 90% is done, it's done when it's done. We all have tons of games to play while waiting for episode 2