Note to everyone: This is a major update that fixes everything from early encounter woes, typos, removal of unfair instant game overs, new interactions of the characters throughout the story, new art for several of the characters, and many more things!
For newer people, you might want to restart so you don't miss anything. For long-time players, these interactions aren't locked out, you can use your old saves, just make sure to snag one from before you left for the 'final battle' so you can backtrack to the other areas. However, it is recommended by the creator that this is 'the perfect time to replay the entire game'. I have also seen more vore scenes including Clara participating in vore, if that is your wheelhouse.
Full patch notes can be seen at the top of the Some Bullshit topic on the weight gaming forum just below the splash image. Again, highly recommend a FULL replay of the game if you have the time as this is likely the LAST update (barring a possible bug fix update for anything that was missed). This is not just an ending add-on, but the inclusion of several events throughout the game, updated and consistent art, and even more world building and character development.