I've been looking forward to playing this ever since the first chapter, I love your art and animations, so seeing this pop up on my feed was a treat! :3
All of the character designs were super cute and the artwork was amazing, I really loved the sprawling group sex pic that transitioned into different poses. The animations were all top-notch and it was great that each sex scene had its own cumshot variation. You can really see all the effort and attention that went into this game, and the series as a whole.
The battle system was fun, and it was nice to see more options added with the powerups you collect, there were more strategy options this time and it really helped freshen things up. The spawn rate for those steam ghosts was a little high though, and it become tedious at times, especially after I died midway through and had to go back to an earlier savepoint. The fights with the girls are all unique though, and they really play to the battle system's strengths.
I wasn't a big fan of the location this time around, everything was drawn really well and it had some nice environmental touches, but the overwhelming presence of grey got a little repetitive. It might have helped to give each floor its own distinct colour pallet, you spend so long in the caves so things start to blend together and it's hard to keep focus. There's nothing in the location that gives you the feeling of progress (visually speaking).
But other than that, everything was great, I loved the interactions with the girls and how your character improves through his quest, I'm still excited to see more, so I'll keep an eye out for chapter 3. Good luck with the series!
One last thing that's been mentioned a few times, there seems to be a bug after you fight the girl in the magic circle, I couldn't really progress after that Dx There was some other bugs too, but it's understandable with a project this big and ambitious.