Yes. Animations will be included in all lewd scenes and all kissing scenes. At the moment, there are no plans for any other non-NSFW animations. They will be included in the game from Chapter 2 onwards (the latest release was Chapter 1.5).
The concept of sequels in AVNs is always an interesting - but thorny subject - and for a good reason: giving the players various (drastic) ways in which they can play the first game, but then completely ignoring said choices in the sequels is... certainly a brave choice. I can't imagine why you, as a developer, would bother with creating these alternate realities if only one is going to be acknowledged for future reference? Seems wiser to 'slim' down these variables from the start, and focus on updating the game faster over managing all these branching paths that will inevitably lead to a "dead end", so to speak.
You do have a good point...
In a perfect world, I would have the player able to choose which ending they wanted to "keep" for the sequels. Alas, Tides of Succession will have 10 different endings (1 solo, and then 3 different endings for each LI) and allowing players to choose their ending is much more work than it's worth.
I also want to point out that the sequels will be 'separate' AVNs. While they'll be set in the same world, and feature some of the same characters, the sequels will have a different MC, different Love Interests, different antagonists and an entirely different narrative. If you wanted, you will be able to play the sequels without playing Tides of Succession. Hence, I wouldn't necessarily look at as a dead end so to speak, but rather an end to the current story and the start of another.
nice game i did constantly crash when choosing not to tell will everything not sure why
That's... interesting. I have no idea why this would happen. I use very basic Ren'Py with no advanced code at all, so if your device runs other Ren'Py AVNs, it should be able to run Tides of Succession. I wish I could help you, but I'm afraid I can't. Fingers crossed you can resolve this issue.