I've come across multiple missing .png bugs that make it impossible to progress the game and other side areas too. Every missing texture results in a "Retry" button appearing, but selecting it does nothing and the only solution is to close and reopen the game.
1. After beating the minotaur on the farm and returning to the main building, a cutscene begins with Cindy. A sound is heard, and the group returns to the yard. Immediately, the text "Loading Error. Failed to load: img/$cowgirlyellow Bust3.png" appears. Nothing can be done to avoid this result, and if the game was saved after defeating the Minotaur, you are stuck permanently.
2. In the Royal City Slums, there is a man wearing sunglasses standing in a closed off area in the bottom-right. Talking to him at any point results in the text "Loading Error. Failed to load: img/faces/SlumMaleFaces.png"
3-4. In the Royal City "Maternal Community Center", the first room on the left contains a couple listening to an instructor about pregnancy. Speaking to the instructor results in the text "Loading Error. Failed to load: img/faces/maternity%20instructor2.png". in the following room, there are many more people in a gathering. Speaking to this instructor results in the text "img/faces/maternity%20instructor1.png".
5. After completing the ice cream popsicle mission for the teacher in Royal City and leaving for a while, returning will have the player find the teacher with a heavily distended belly. The teacher will request that you teach the class for her, but upon saying yes, you will receive the text "Loading Error. Failed to load: img/characters/$SchoolTeacher Hyper.png".
6. Upon progressing in the story and going to the Royal City Church, you find the corpse of Commander Blake. A cutscene plays where the Commander is revived and is now pregnant, and the party is invited to visit the castle. A loading screen appears, followed immediately by the text "Loading Error. Failed to load: img/characters/$CommanderBlake.png".
I am unsure of what is causing these glitches, nor am I sure whether or not any of these prevent further story progression. Hopefully this helps in some way.