Really and truly, I like making the vanilla games as difficult as possible. Not only because it's more realistic in this fictional world, but also because I have 0 plans of making a vanilla route, only those happy endings that you can reach by winning the minigames. The difficulty of these minigames, along with things like my name, is another way of preventing people from getting the wrong expectations about vanilla routes. Because of that, it makes sense for the rare happy ending to be difficult to attain.
With all that being said though, I have been thinking of making them a lot more possible to win on easy difficulty in future updates.
Viewing post in Life After Victory (v0.13) comments
I'm not particularly interested in the vanilla route either, but you do have two ending scenes that are locked behind a high relationship with Yuto. If you're going to have them, then I think they should be less frustrating to achieve. I am glad that you are planning to at least make the cheat mode more doable, and I am fine with the Natural path being progressively more impossible. It makes ludonarrative sense like that.