This is my first time ever using toys like this, so i dont have much clue on connection flexibility of toys like these.
It looks like the app uses some kind of Lovense connection method as it uses a qr code to connect to the app and has a similar UI to their remote app. The app also seems to be affiliated with Lovense as it sells toys from them.
As for the toy, its an Aliexpress toy by Dongguan Duoguo Zhichuang Technology Co., Ltd.
If i cant find anything, i might use wireshark to maybe steal the packets for a custom connection method as the toy is relatively versatile especially for the price and would be worth my time.