It's not Johnny B. Goode.
It's a common mistake for people to think a jangly guitar piece in the 1950s rock and roll style is Johnny B. Goode. It can be fairly difficult to tell many songs of that era (or emulating the style of that era) apart from a short section, particularly when they're trying to emulate Chuck Berry. Hell, even Chuck Berry songs can be difficult to tell apart at an immediate casual listening to a clip.
What makes me fairly certain of this however is that there's no mention of Johnny B. Goode or Chuck Berry in the credits (as far as I could see- I could be mistaken, I beat the game fairly late at night).