I am working on replacing it! In the About Page inside the game, you can see my stance on this as well.
> There will not be any AI art in the final release of the game.
> This is a free game with no ads, and was initially made for educational purposes.
I am currently looking for a real artist to redo all of the AI art that is in the game. All of the AI art will eventually be gone, I promise. I dislike the idea of artists not getting compensated for their work as much as you do.
However, I do want to retain the quality, and that is why it's not a quick fix.