The window is so large that the expand button is off-screen, aka I can't expand it. While we're here, I did forget to mention that the game does have some performance issues.
Okay, not a big fan of having to start over and over again, even less of a fan of...crashing my game for whatever reason (other than 'it's cool'). I do think he over spawns the eye enemies and there's no real way to avoid taking a lot of damage and/or dying.