Press Z to advance the game.
It's stupid, I know.
As for myself, the game will sometimes suddenly decide that random button x is being held down constantly. The last time this happened, it failed to fix itself after a game restart or a reinstallation, but fixed itself after a computer reboot. This time, it won't even fix itself after a reboot. It's not a hardware problem, because no other program registers z as being constantly held down, and the problem persists after unplugging the keyboard/gamepad. I had the problem 10 minutes ago, wrote up this post once, then it randomly fixed itself, then it popped up again and I've had to rewrite this post. And sure enough, I check it again after writing this post a second time, and it's fixed itself. Whatever, I'm going to leave this post here anyway.