Variables for this game is hidden in the rpy files of the games folder. The variable viewer only shows things that have been changed and if it's mutiple different things that change that represent a single thing (a_willpower btw is hp so find what variables it's made of) then you have adjust all of them. I only found 3 variables to adjust when searching in a 1 hour look around but they didn’t help immediately as it raises the max level cap, max energy cap and max hp cap that you can increase to. It varies game to game, some are simple, this one isn't and requires effort. The alternative is throwing money at the problem and getting yourself the Dev version.