Now about that misclick on level up. I agree there could be a function to be able to reverse last pick, but it would have to save the result temporarely so you can not abuse this to reroll high stats.
I think the best way to do it is to have it so you choose your stats but don’t see numbers immediately, and then you click a “confirm” button which then does an animation that reveals your actual rolls for each stat. The nerd in me says “dice roll animation,” but I don’t think that really works for this game’s style.