It's alright. Honestly though I expected a bit more than that.
I think the battle system is a bit weak. It tries to add a bit more by introducing "states" that multiplies damage dealt (red is highest, good vs purple, and blue. Purple is second, good vs blue. Blue lowest), but it doesn't really impact the damage all that much. There's a bit of a difficulty spike at the final boss, but all of the bosses are basically damage races anyway, so it's not bad. To be honest I think it's just a short game.
Story is fine. Not really that interesting, imo. Just a shrine maiden with a katana sealing demons, basically. I don't really care about the other characters, but at the same time I think the combat and short length makes it a lot more tolerable.
What is really disappointing is the lack of H-scenes. I guess it's appropriate for a small H-game to not have a lot of it, but most of it's just kinda standard. I really wish the lewdness would have more of an impact, though. The fact that the monsters are one and done with no lewd variations is disappointing.
Overall, it's ok. Could use more monster H-scenes, especially lewd variants of it.