That thing with kicking those stone's and the goblins heads exploding was BS. I mean BS not like "unrealistic", but like in "Over the top. It killed the mood, because it was so Chuunibyou-ish."
Demon Sword: Super Powerful, seemingly no down sides, except you can't cut humans (, but then you also can't cut your allies or yourself and it can't be used for evil deeds) and it can be bought for just 1 SP. Shouldn't its name be "Heaven-sent Sword"? If it doesn't get some hefty downsides or it is explained, why such a force of good-alignment is called demonic, I will ... be very unsatisfied!