If purpose is to give big grindfest, to be difficult game - yes, Shimmering Horizon does give that part. Really gives. Roguelike grindfest that requires preparations for hours, to drop rare goods AND to finish each boss with limited amount of goods. Kind of reminds "Mistover", but it's RPG Maker here. Being hard has a purpose, otherwise game will lose one of its points. You're just some blacksmith who has to explore dungeon and progress through, dealing with everything this messed up world throws at you - and there's enough people who play games like Dark Souls series for this feeling. And if someone wants casual experience - devs buffed casual difficulty again, so players can choose to do it easy way. This one is especially good for "H" enjoyers - those look very juicy in this game, as well as voiced.
Can't quite compare to Blacksouls series yet, because don't know lore/story behind Shimmering Horizon (still far from finish + wanna wait for possible patches).