I realize the game is basically done, and maybe I'm just overly sentimental, but I always sort of like it when games like this do some sort of post credits epilogue where it time jumps some distance into the future to show (or at least describe, even if it's just text) some important event(s) in their future lives together.
like when they (all 3?) get engaged, or married, or birth of first child, or birth of first grandchild, etc.
Though I guess some of that could be incorporated into Penny's game. Presumably she'd be invited to the wedding, and would likely be aware of what happens in their lives. (likely need some way to specify which of the 4 endings occurred though.)