Alright then. I'll do more research about the Chinese version of Sonic Jump.
In the meantime, I managed to play the Pleasant Goat game, and I have to say that this is not only an official game, but also better than Sonic Jump ^^'
In fact, I believe that this Pleasant Goat game feels like the true successor to Sonic Jump and what Sonic Jump 2 could have been ^^'
Also, this game actually works on my phone using Android 8. Meaning that there is a possible way to make this version of Sonic Jump running on modern hardware. But I have to figure out how to fix it.
By the way, I have a question : Do you think it's a good idea to make mods of that Pleasant Goat game ?