So I played this game for about 10 hours over the last week and got to the point where you get the 4th girl (Ame) and I was almost considering dropping the game.
The money gain is incredibly low for what stuff is worth and how expensive the many offerings are (Items, food, and Upgrades). I ended up discovering where the save is and modding in pretty much 9999 of everything.
Once I did that, the game is actually very fun! Once you actually start accessing The Client Scenes (NTR) there is actually some good writing, animations, and overall a really in depth hentai game. Without the use of cheats? This game is unbelievably frustratraing.
From the 10 hours I played I would suggest the following (Do note as a Dev, I know the feeling of getting bombarded with suggestions and balancing content/systems. Feel free to ignore me since at the end of the day, this is your game. I'm just sharing what I THINK could help keep players engage without having to resort to modding saves.)
-Increase Money gain so that you are getting $1000 a day in the early game, $2500 in the mid, and about $4000 when you unlock Ame (More money means more ways of investing into the cafe and the maids. Playing for 3-4 in game days and only having enough to Upgrade a Maid's Skill once is not fun at all)
-Tune Favor and Popularity by giving more early on and upgrading the amount through Perks or Shop Items. Basically allows players to at LEAST upgrade one Perk per day. Lewd Gain can be kept as is since the slow gain makes sense
-Decrease the amount of "Give Number x Amount of times" to 5. Since the game uses RNG, 10 numbers to say the Jock for Catherine can take HOURS and it's damn near impossible with the current stat distribution. To even upgrade her Give Number Perk, it would require heavy amount of investment at the cost of simply not doing anything else to the other 3 girls
-Have a way to buy more Chat Times through the shop. Once a day is bit restrictive considering you have 4 girls to stat level up at a given point. By all means make the item expensive but 1 Chat per day is not helping the heavy Grind.
-Rebalance the Random Chance offerings (The little screen that pops up that usually gives you money, invites a customer, gives Lewd/Fame, etc) to give a bit more. This is the easiest way to allieviate the grind. Instead of giving 1 Lewd for say Ame, giving 3 would work incredibly well. Instead of getting $100 by inviting a "friend" make it $300. Small increments are night and day considering how much the flow of the game is dictated by stats.
And finally as more of a bug report, I think this game has a memory leak happening somewhere. I went to save my game earlier because the game suddenly started to stutter during the gameplay. Basically the timer was working normally, but the girls and customers were moving at slow speed. Soon as the day ended, I got the sex scene where you fuck Catherine on the counter but the animation was flickering and all I had was a grey screen before it. Once I pulled up the save menu, the game crashed.
Before anyone asks, my computer runs this game flawlessly but I've noticed that playing the game for more than 30 minutes, makes my RAM usage spike. It has to be a memory leak of some sort. Just posting it in case the Dev hasn't noticed.
Again, feel free to ignore me. Just wanted to help out a fellow dev. Cheers!