I Spent a fair time yesterday playing and replaying the demo, and my initial impressions are quite positive.
the feel of the game is so much like the previous Pervert action games that if you have played them alot then you can get to grips with this easy which is great, the graphics are so much better then the previous games and the story that is in the demo is very interesting so far.
The girls in the game are also interesting tho i agree ike's boobs might be a little too large i personally love Rio i thinks she looks so sexy or as much as she can do in a game like this.
i've not found any game breaking bugs or any massive spelling mistakes and the sound and music is also a very cool addition it sets the plot and environment very well makes it feel like a mystical and sometime dangerous place.
If i had any major complaints and i do have just the 1, it would be the combat system as i feel it could use tweaking a little and balancing the fights out as the the monsters seems to do way too much damage and they seem to avoid way too often which can make it impossible to win some of the fights and a couple of the monsters can ever 1 hit Ike and if your very unlucky Fumi. and the moster that regenerates it's HP every turn gains too much HP per turn so you at best only end up taking 5-6 hp off them and then if you miss on the next turn it regens back up to full HP making it impossible to win that fight.
I know this is a work in progress and these are just my thought's based on what i have played, i hope they can be of some use to you.