I just played the latest update and really enjoyed it. All I can say is that it's my favorite game on my entire personal playlist (you know what I mean). I hope Cow Girl joins the harem. (Pss. If anyone wants to exchange codes, just ask.)
There are hidden codes in the game that you can use to unlock images. You can find them in different parts of the story. They also have them on Discord, as far as I understand.