According to JoiPlay it's not an emulator (software that enables one computer system (called the host) to behave like another computer system (called the guest)) it's an interpreter (a program that can analyze and execute a program line by line). So it can't run Unity games because it would to emulate Windows API (certain DLL files) to run. That's Unity games have to be specifically compiled for Android. JoiPlay can only run RPG Maker XP/VX/VX Ace/MV/MZ, Ren'Py, TyranoBuilder, and HTML (not HTML5). Source: JoiPlay