I straight up think Glu should pay me a royalty on this.. but, anyways.
Walk off hero should absolutely have a bonus 6th level that you need to pay like 50 gold to access. On the bonus level, there's no starting from pitcher 1, you either make it all the way to the end or you lose. At the end of it, you get a legend + legend xp. Once ppl get to the upper levels, they would spend their gold very aggressively to replay rounds so as to not reset and lose their chance at earning a legend.
"I'm a naughty little screen tapper" - Me