I wrote a lot but lost everything because of a page refresh, so shorter:
The water looks too sharp. Maybe a darker blue line as border? The magician sound voice broke immersion by making me think of an IRL person making the sound. Boss HP is hard to read, maybe a health bar. Character walking animation make them looks like they limp.
Gameplay broke for me: just going into melee with the heroine by side was easier, faster and safer, I could heal her at full under a group attack (except the very first fight). Gameplay may be confusing because of lack of UI to know if the heroine is in follow or stay mode. I still like the originality of the gameplay.
The visuals are nice and they have a handmade charm I love. The music did its work.
NSFW content was too tiny to reach me, but the end surprised me and the NSFW ending scene was a bit funny. The cover image is appealing.