Tried this with one of the games called Duels, by Deemedya.
When I pick a binary file then the metadata file I get the following error:
Initializing metadata...
Metadata Version: 27
Initializing il2cpp file...
Il2Cpp Version: 27
Searching...
CodeRegistration : 0
MetadataRegistration : 0
System.InvalidOperationException: Sequence contains no matching element
at System.Linq.ThrowHelper.ThrowNoMatchException()
at Il2CppDumper.Macho64.Search() in C:\projects\il2cppdumper\Il2CppDumper\ExecutableFormats\Macho64.cs:line 95
at Il2CppDumper.Program.Init(String il2cppPath, String metadataPath, Metadata& metadata, Il2Cpp& il2Cpp) in C:\projects\il2cppdumper\Il2CppDumper\Program.cs:line 224
ERROR: An error occurred while processing.
Duels is also a Unity game.
Update, nvm got it. Was feeding wrong file into binary. Not unity framework one.