The end product quality doesn't heavily rely on the engine used, but on the talent and dedication of the creator. Atm, "QuietGirls" has the best graphics out of all rpgmakers I've ever played while "Creature Hunter" has the best gameplay (all on a personal level).
The graphic and pixel sex animation is pretty as you would expect from Dieselmine but I have yet to see a game with great gameplay/story from them. I mean, whenever I see people praise Dieselmine games for being one of the best indie hgames I don't seem to be convinced at all, as most of their games, if we take out all of the pretty graphics, felt not much different from any other normal hrpg that is pumping out everyday, contrary to games like "Succubus Prison", "Black Souls", "Monster Girl Quest Paradox", etc. Well I'm not trying to belittle Dieselmine, I enjoyed most of their games, this one included, all I'm saying is I don't understand the logic behind one of the best indie hgames many people are labelling their games as.