I agree that the title for Legendary Axe blends into the BG for the American version... But looking as the covers here, a LOT of them have curved titles: Andre Panza Kick Boxing, Legendary Axe, Monster Lair, R-Type, (Even Ordyne to a small extent) all have curved titles. I wonder if that was a theme or part of the turbografx styleguide at the time?
Curiouser and curiouser.