In it's current state, it is a pretty well contained demo. Difficulty is on the higher end for rpgs, but quite managable, especially if you follow the level suggestions on enemies. You level up fast as well. Only a few battles per are needed.
On the good side, semi-flexible progression and rewards for playing smart. Badges are the side progression, and are needed for some of the most important and powerful skills. When you level up you also get more mundane but useful abilities as well.
On the neutral side of gameplay, as mentioned it is on the harder end. You will take a lot of damage and take it often. In addition to that, status effects in this are exceptionally dangerous, as you only have one character, and there are enemies that can stun and blind you.
On the bad side of gameplay, combat speed is quite slow, didn't notice any way of speeding it up either. I end up spending like 5 times as long watching attacks go by than actually executing my turn. The second boss is really bad with this, as at peak for me there were 6 enemies in the battle, each one taking several seconds per action.
On the erotic content side of things, it is quite nice. Limited in the current release, but makes up for it in quality. Was a fan of their work before, but the animations are quite smooth and you are able to replay both them, and get static pictures as rewards as well.
Sounds are standard, so not much to right home about there.
Story is basically a way of getting you to the erotic content, not much else.
Giving it a 5 for the erotic content, and being both a fair and challenging rpg framework thus far. The only downside is the length right now, but there are a several dead ends which seem to lead to areas which are not yet available.