Sure!
The first one that comes to mind is Mystic Dynasties. Below are links to the finished game and each individual route.
https://aeondreamstudios.itch.io/mystic-destinies-deluxe-edition
https://aeondreamstudios.itch.io/mystic-destinies-serendipity-of-aeons-shou
https://aeondreamstudios.itch.io/mystic-destinies-serendipity-of-aeons-tatsuya
https://aeondreamstudios.itch.io/mystic-destinies-serendipity-of-aeons-shinji
https://aeondreamstudios.itch.io/mystic-destinies-serendipity-of-aeons-takumi
https://aeondreamstudios.itch.io/mystic-destinies-serendipity-of-aeons-hikaru
https://aeondreamstudios.itch.io/mystic-destinies-soa-hikaru-book-2
The next I'm linking to is still in progress.
https://zeiva.itch.io/anicon-sheep
https://zeiva.itch.io/anicon-cat
The next is the Wilder series. The creator eventually dropped this for personal reasons, but I think most people were okay with it since we respected her reasons and we did get two complete routes before that decision. There were five routes planned initially.
https://sonnet009games.itch.io/wilder-rans-story
https://sonnet009games.itch.io/wilder-bahadurs-story
These next guys, I don't know what happened. They are released two routes, but they then just vanished.
https://lettucewaltz.itch.io/sp-mikio
https://lettucewaltz.itch.io/sp-hayato
I'm not a creator, just as avid player (LOL), so I don't know the intricacies of how they do this. I believe the first and third I listed are still around if you have questions. I'm not sure about the second since I don't follow them. The fourth has been radio silent forever it seems.
I know that there are some creators that give access to the game and send out updates with additional routes as (DLC, maybe?), so in those instances the player buys it for the full price. I'm not sure how it works, and unfortunately, I can't remember which of the games in my library does that. The only one that comes to mind is (https://celianna.itch.io/tailor-tales) -_-
Lastly, you don't have to do this. We'll wait! I thought you had already knew about this, which is why I even bothered to ask. LOL