[Aeronwen]

X axis isn't inverted anyway.

Imagine your head in place of the joystick. Pushing the top of your head forward (up) makes you look down. Back (down) makes you look up. Pushing the top of your head to the left makes you tilt your head left. Right leans right.

Not that it matters much, since tilting your view to the side isn't normally useful, left and right get mapped to turning instead.