Has potential but its still a tad too early to say anything. The story needs to unfold naturally, but more importantly all the erotic content needs more build up and vastly more dialogue. As one should never forget the importance of sexual tension and erotic writing, for that is both the filler and the spice to erotic content. Though regardless of that concern the art is of overall good quality, naturally it needs polishing as to the heroine's face and some other areas but overall a really good start especially with the penetration animation (Most creators do a terrible job with animating that). Equally the main heroine has a nice erotic design. Lastly, I will give some points for having a decent moaning loop and to the erotic mini game.
As to my suggestions for the erotic content I'd firstly strongly suggest beefing up the dialogue in the H-scenes and building up the MC and heroine's relationship. Next, to take your time with the main heroine as there is no extra points for rushing to sex and often there is more to gain by taking the slow approach and having the heroine slowly warm up and give in to the MC. Overall foreplay is a good addition to the H-content and can be a good tool for adding in added romance and character development (If you have them talk and discuss their past during some slow and soft foreplay) and can allow you to really build the sexual tension (If you have some good teasing and imagination play for example). Lastly, I'd also suggest adding bonus or even a route/relationship system tied to the erotic mini game based on whether you get the heroine to climax and other possible objectives.
After erotic content and story there comes gameplay and here we have a pretty neat system in the works. Though naturally work needs to be done to get rid of bugs and to streamline the controls. In particular I found the dialogue boxes and fiddling with the various menus to be annoying to say the least. But smacking at the enemies wasn't bad with the MC's great sword feeling nice an heavy but naturally more work needs to be done to improve this gameplay so as to be slightly challenging and fun. I'd honestly like this to be a beat-em-up game on par with the classics maybe like a solo Castle Crashers.
Regardless, this was a interesting but short demo which showed potential but sadly lacked enough details to know whether or not you are heading on a good health track or not. Though work hard and show us what you have to offer for I hope for the best.