Don't even have to go that far, the "very hard game" immediately ruined any credibility they had
To be fair, i did die the first time i faced the grave keeper. The game usually rewards careful and methodical progress, so seeing a boss spawning minions faster than you can kill them with regular attacks was quite exciting.
Sure you essentially have endless retries if you escape the zombification, making this game really easy, but this is by design of the dev. Lelia needs to lose first and then win, in order for the many corruption facets of this game to work. So making this game hard yet forgiving is necessary.
After all Lelia has to deal with the aftermath of any defeat she suffers. Its just more erotic that way. The final boss of the first game proves this. Each time Rabiane lost, she was defiled and lost more and more of her purity, becaming a seedbed at the end.