First of all: Here is an actual game, and for this it has my respect.
Though it doesn't have a loss condition, it doesn't really matter in this case, since it does have gameplay. Actually it's better that it doesn't have a loss condition, as it relies on carefree exploration and seeing how different things affect other things, and how you can use events to progress.
It's also a properly full game. Though it's short and strict (after you grasp your surroundings) it has a steady progression with each female. Each female follows a specific rotation, and once you learn that it becomes really simple to understand what you can and can't do with them. What you can do with each character and object is very defined in a list of actions (look, talk, use, take, item, powers).
Basically, you spend powers 1&2 for puzzle solving or to setup events, and then powers 3,4,5,6 (6 being the end-game one) to progress events.
You replenish your mana by having sex with the doll (kinda like a succubus) and gain Sin (like XP) by doing a new "naughty" thing with a female. You then spend your XP to increase your powers.
Btw, it makes *perfect* sense that you're adopted in this family - it would also make sense that your father married another woman (your step-mom) - since you look nothing like the girls. I suppose being adopted is the canon in the game, although you can select your relationship at the start. Which, btw, is only ever mentioned in like 1 or 2 scenes.
But here come the suggestions / bad / weird things I have to say about it.
1. Some actions from the list are utilized really rarely. For example "take". There's not a lot of items you can actually take by hand. You mostly use telekinesis. I think "take" is used in like, 2 occasions.
2. In order to have sex (end-game) in some cases you can use "use" action, in other cases you have to "talk to" the character.
3. Though it's stated you have to gain Sin to upgrade yourself, that's not the case when unlocking new powers. You have to also do the previous spell a number of times. Sometimes you also have to see a specific event.
4. Warp Mind power is too "general". It's basically a "do everything" power.
5. You cannot use a combination of powers.
6. So the way corruption is explained is a bit peculiar. It says that with "control mind" you will be able to get your semen on them, and it's addictive (therefore leading us to corruption). However, we've already done that in many scenes before. Especially if you've redone same scenes a lot, this means they would already be addicted to it no?
7. Watching TV in the afternoon was fucking awesome. I'd love to see more progression of that event. Like somehow distract the step-father using the maid or the step-sister.
8. I disliked how the step-sister's shorter skirt, and the step-father's attraction to it wasn't expanded upon. This would actually be a great way of distracting the father in 7.
9. The way the gardener is out of the picture is by... just waiting. In the afternoon/night you can go to his shed no problem. No powers required. I'd prefer it, again, if we could use the people from the house to distract him instead, or some other puzzle solving manner.
10. There are some peculiarities with the lust power.
11. Is it mind control, or suggestion?
It seems that even though you're casting mind control, they have to arrive at the conclusion themselves. Like, they have to realize that that's the reasonable thing to do. Though I loved that, shouldn't then the power be something like "Enhance Suggestability" or something? See this is the kind of problems I have with this game lmao, not that important, but important enough, I suppose? xD
12. Upgrades are too cheap.
Even in the last two upgrades, I had a ton more than 15 Sin, yet they cost like 2 and 3 Sin. And after the game is won, you get the ability to get new outfits for the doll which, why are we even interested in that. It would be far better to have different scenes with the females, or new outfits with them, instead. Like, instead of 6 outfits with the doll, 2 outfits per female.
13. You have to have sex with the doll to regain mana, yet her scenes are unskippable. It soon becomes more of a burden than exciting. It's also not that hot, since you have to ejaculate, in order to then have sex with someone else, right? Therefore, it kinda makes you think that the ejaculation with the other females won't be as powerful. It's weird to think like that, I know, but it would make it hotter if the MC had to build up power.
I understand though that supposedly, you are blessed with unlimited sexual prowess or something. So I can get behind that. I'm just talking about how it "feels" when being immersed in the game.
Anyway I'm gonna leave here cause I've already written a lot. Though mind control type games aren't for me, it was refreshing to see a dev who really wanted to make an actual game, and feel the sense of exploration. This game imo deserves its good rating. Good job.
PS: Also good job saying that mind control cannot make them do something that they don't already want to do. I hate it when agency is removed.