It helps redirect Windows-specific system calls to Android equivalents.
To use JoiPlay for supported Unity or other engine-based games, follow these steps: How to play RPG Maker VX Ace game on Android using JoiPlay joiplay unity plugin
Unlike the dedicated RPG Maker Plugin or Ren'Py Plugin, Unity support often requires more complex "translations" due to how Unity compiles code for Windows (x86) versus Android (ARM). The JoiPlay Unity plugin functions by: It helps redirect Windows-specific system calls to Android