Is ntr in the game is skipable or avoidable ??
Avoidable.
I understand the concerns around development time. Version 4 (4.0, 4.1, and 4.2) was larger than versions 2 & 3 combined, but overall took less time. While I'm proud of the scenes, this is not sustainable for quicker development.
I also want to simplify the branching paths. The Monday afternoon scenes essentially provide the player with seven main routes to choose from. This makes the game feel smaller as there is a lot of content a player won't see.
As we advance, I want to aim for no more than two routes. This allows player choice and provides replayability. There will still be routes within the scenes themselves.
Version 5 will also add a use for the panty collection. But be careful, someone might walk in on you!
Also, while the dev notes for v4 said not to create saves during the part-day events, it's obvious not everyone headed that warning. Additional effort will be needed to ensure less is changed and/or the onload event handles the differences better.
I've seen some discussion about the gallery. In other games, the gallery has a set number of images per version update, and these are displayed with a padlock until unlocked.
Mothers and Daughters uses a different system where the look closer images are added to the gallery as you encounter them. This means the gallery isn't aware of the images you haven't encountered yet.
If there's enough demand for change, I will look at implementing a padlock-type display in the gallery. However, some look closer images have alternatives depending on your stats with the character. At the beginning of the game, the player has a look closer option with Victoria. If you don't have relevant stats with her, she will actually cover her cleavage in the look closer image. This also occurs with Catherine in the latest version.
I know people ask for complete save files in the hope of picking which scenes to play. Currently, the game doesn't have a replay gallery. Due to the stats and choices used throughout the game, it's not easy to suddenly jump to a random scene and expect it to play out as you want. How to implement a replay gallery is on the todo list, but it's not a priority at the moment.