The method I know how to force apps to ignore outdated SDK on Android is to install Android Platform tools and write "adb install --bypass-low-target-sdk-block app.apk" in your Terminal on the PC, alternatively you could try using adb in Termux, but I am not sure how to set that up. Edit; Alternatively you could try to run the Windows version of the game via JoiPlay and a RenPy plugin from the Creator's Patreon page, the game is a VN and probably should work fine, that would ignore the whole process of using Terminal commands and bypassing SDK