I think 50 is plenty high for Campaign. You can go as high as you want in Endless Mode. There's nothing really to "farm" for outside of the Blacksmith Upgrades and maxing out your talent trees. Sometimes I wish we put in some randomly generated items players could equip, but it was too much for what we wanted to do with this game. The sequel (if it comes) will definitely have some awesome things to farm for.
Hello hollowpointm16! did you try clearing you cache and close and re-open the game ? :)