I really liked this game in the beginning. Cool art, exciting girls and story, interesting play style and sexy sound and music. However I've found that, like a lot of puzzle games of this type on Nutaku, the game very suddenly becomes insanely difficult very early on, halting your progress a little too early and with few options for how to overcome it. I'm still stuck on Poderosa and no matter how many times I play, I still can't come close to winning without buying power-ups. Power-ups should make winning easier for specific situations, not be a requirement just to complete a basic level. I've tried all different strategies to maximize points with fewer moves but even chains of twelve balls seem to give you very few points compared to what you need to win. Even if you buy a power-up, due to the unpredictable nature of what color balls you get and how they settle, there's a high chance that you'll still lose and you'll have wasted a power-up.
I don't mean to whine. I don't mind games that get increasingly difficult as long as there are ways to overcome those difficulties with dedicated play. I always go back to Kamihime Project as the poster of a good, fun hentai game. There are plenty of challenges that are still too difficult for me to complete even after playing for as long as I have, but at least I know that by investing time into the game I'm improving by getting better characters and improving my skills so that I can overcome greater and greater challenges. And that's why Kamihime Project is so successful. It makes you want to keep playing. There's no worse turn-off than a game that makes you feel like, two days into playing, that it's become too hard and you're already as good at it as you're ever going to be. I'll keep trying for a while but if this is going to turn out to be a pay-to-win like Pussy Saga where you make a bunch of progress and then hit a brick wall you can't get around, then I probably won't be playing too long.