Here's some ideas I've had for BFNS Plus Ultimate Edition. These may or may not end up getting added, or these ideas might change into something else.
1. A score indicator when you click on certain levels to play them. It would show your current score out of the highest score you can get on that level. For example, 10000/30000. To get the highest score, you would have to complete all objectives in a level.
2. Golden notebooks. In Story Mode, there would be a golden notebook hidden somewhere on each floor. After finding it, you would have to complete a short minigame in order to collect it. It would be one of the objectives you would have to complete in Story Mode if you wanted to get a higher score.
And 3. A tutorial level for Story Mode. It would be optional, and teach players the controls and how to play the game. It would also contain the intro to Story Mode, and show how your friend, Jimmy, lost all of his notebooks.
Well, those are some of my ideas. Also, stay tuned for future development videos, which will be released on the BFNS Plus Official youtube channel!