Greetings. I have played the game, and have a review to give.
1.I would definitely recommend shrinking the entire map. It's way too big. The Adventurer's Guild, the Mansion, the open fields, every map in the game could use shrinking except for the sort of starting room. Going from Point A to Point B takes far too long. Also, I found Aqua twice in the minigame once.
2. Increase drop rate, decrease enemy numbers. Especially in the main map, there are dozens of enemies just... everywhere. In the middle of the room. And fighting them is barely worth it, as the exp is a pittance and gold is nearly useless. The only thing useful is the materials they drop, to which only 2 of 4 enemies I've seen have anything worth using, the rat and the bat.
As of current, the best way to grind the materials for the Time Orb, the one and only craftable item in the game that extends the search timer by a mere 30 seconds is to spam Steal on rats and bats. Moreover, I do not think Limestone is a renewable resource.
3. Scenes. I know you have them. Apologies, but I ripped open the game files and found a bunch of scenes that weren't implemented. Either that, or the game was bugged and didn't allow them to appear. Namely, Aqua and Darkness' sex scenes, as well as their 'target' scenes.
4. Endings and quests. It may be a bit premature in the development process, but I know you have the CG for the 'all NTR end'. It may be wise to implement an ending, sooner rather than later, as the game, beyond a certain point, falls into a bit of malaise. There's nothing worth going out for and nothing worth staying in for. Towards the end of my playthrough, I exclusively ran between the mansion, adventurer's guild, and outside fields to speedrun corruption. Eventually, everyone became corrupted by pleasure, but this didn't end the game or anything else.
5. Not actually a valid criticism, so you don't have to think about it that much. As of current, Aqua is the most useful character, as she can heal, deal AoE damage, tank, and pretty much all other needs. An ideal party pretty much consists of Kazuma and Aqua, Kazuma stealing constantly while Aqua blows everything up.
This game is in Ver 0.1.0, so I don't imagine this is its final form. However, might I add a suggestion of my own, to rework the minigame?
Make it so the timer decrements not based on physical time, but based on the 'actions you perform' and the 'rooms you check'. Perhaps give us a cap of 5 minutes, with 'listening' being 30 seconds and 'searching' being a minute. Listening will confirm if a girl is present, and searching will recruit them. Then, add some 'secret NTR' scenes where the girls are having stealth sex with John as you pass through the room. The sound if you listen, and the scene if you search. There are various rooms in the mansion. Bedrooms. Bathrooms. Libraries. Offices. Scenes could be produced for each for each girl, for each location. Perhaps that will lead to file bloat, but the zip file is already about 750 MB, so I think you've already begun to suffer from file bloat.