OK I worked a bit on this. Disassembling shows that android version is pretty well obfuscated and the usual Il2CppDumper is not enough.
I even tried on PC. If you manage to unpack upx, it's also vm protected. Every single string is encrypted (or is it because it's Chinese?), even the imports are not clear strings. They even took the time to pointer reference all api calls with getprocaddress, just to avoid linkage on import table.
These guys know what they do, they really seem to use cheat makers techniques to protect their game.
If any modder wants to try something, I've seen someone suggest rooted android phone with Magisk, Riru core and Riru-Il2CppDumper to get a dump.cs file with all the classes, structs, enums,...
Way beyond my level on phone gamehacking