This is interesting. While at first glance it seems like it should be a happy end for Garry and Ib while Mary withers, Ib is facing Garry's portrait should he be left behind in the Fabricated World, and Garry is facing Ib's should the same happen for her. It almost seems like the whole thing is an illusion. Garry even appears to be crying while Ib's expression is oddly peaceful.
This is great because it could be so many things all at once.
I was able to download IB on my mac finally, and now I'm so glad I can finally play it now instead of just watching others~! I really like this drawing it's bittersweet because everyone's happy that Garry and IB are fine but it's a sad demise to Mary.