A really strong start. I have to admit of not being a fan of the Daddy-Daughter games, - because the likes of DmD and Parental Love, where the daughters are utter retards, and instead of being elevated by the somewhat sensible MC, they are being brought down to their levels - but this seems interesting enough, especially if we can keep it mild with them, and there are other pursue targets.
The story is very emotional, I would've loved a Gracie reunion, but I can accept that her state is needed for the story flow. There are a variety of characteristics already, and not the usual tropes either, render wise it looks spot on, dialogues are also great, no bugs, somewhat branching routes, the choices are placed where you need them to be, it's being put together nicely overall.
A few suggestions though. Modern day smartphones around 2005 makes no sense, the first iPhone came out in 2008. The daughters age being chooseable and the timeline discrepancies just gave foundation for numerous pointless arguments already and logical holes, which you already had to address, and not having an upper cap for their age, is all immersive breaking.
Not sure what to make of the last cliffhanger, unless it becomes some unnecessary drama, I'm down for it.