I think this game needs a new cheat code - one to make all your living heroes go up a level automatically. Firstly because levelling as it stands is a chore due to the way the experience penalty system works, but also because sometimes you just want to set up a one-player-only custom game to test out build orders and which heroes to pick in a low-stress environment, or even just to see the ultimate abilities in action, and I think a good game should accommodate that.
If the developers could add that as a new feature before release, Iād be much obliged.