Okay, so, obviously, I like this game and I know it is in the earliest stages yet, but here is what I see holding it back currently... For starters, the aforementioned lack of the ability to build funds while the app is closed. But more than that... the odd system you are using for the way cards work. I have played a LOT of idle games, even ones that are NSFW via Mikandi and others. All of them have one thing they share in common, in that the higher the card rarity, the more money that card makes, starting with a slower progress time to reach the 100% that gives funds than the previous card had. I can't help but notice all of your Pregnant cards make the exact same amount when they reach the same levels. For example, a level 2021 Rias gives the same as a level 2021 Asia and a level 2021 Xenovia. It makes the rarity of the cards literally worthless. Add to it that the cards don't appear to get faster with upgrades, each having a predetermined speed that doesn't improve, and that makes it more profitable to just upgrade one card - the fastest one - than it does to invest any money in the others.
That being said, I am severely confused on Xenovia. She accrues funds at a faster rate than even Asia does, at around a 1.2x speed of Asia, making her the most valuable and profitable card. It confuses me as, like I said before, each subsequent female otherwise is slower than the last. Yet, there is Xenovia, unlocked third, being faster than Asia.
Also, are you aware upgrading Fellatio cards does not increase cost requirements and that it is always at a static $6 per upgrade?
Okay, so, I apologize for always having ideas to improve this game, as I'm just trying to help and excited for it, honestly. I have a LOT of ideas for ways to make this game amazing, though I try to bite my tongue on most and let it be your vision as it should be. But, this idea... it made me feel it could fix the outlined issues mentioned above and make the game more accurate to the girls' personalities. What if their 'stats' were based on the character? For example, Koneko is the hard hitter of the series, so her meter could be slowest but give the most per completion. Asia would be fastest and weakest payoff. One character could cost less to upgrade and Rias could be a balance. And so forth. Then, if you unlock artifacts or buffs where we allot them to a character of our choosing, it means players could customize via focusing on that attribute. For example, capitalizing on Asia's speedy return with an artifact that increases a chosen card's speed by threefold would make her make more than one that gave 1.5x profits, whereas Koneko could benefit from speed or profit, and a different charact, maybe Akeno, would be profit-focused, allowing you to build and design you deck something akin to how Clicker Heroes does at end game. Just a thought I wanted to get out there. And again, feel free to ignore it. I'm sorry for seeming like I am pressuring or too overwhelming with my ideas. You have no idea how much I am sad this anime never got continued and every DxD -based VN or RPG I play has been, imho, boring or poorly done. Yours has promise and potential for once. So, I'm enthusiastic. Feel free to tell me to shut the fuck up if you want. lol