Multiple files in GameZero

My game project is becoming bigger, so I got to split it different files. But as soon as I use the rungame("filename.fl") command, I am getting an error message for the usage of include.
Is there a way to work with multiple files in GameZero?

What error are you getting? It’s been a long time since I used GameZero, but remember include working.

ERROR: LoadError: UndefVarError: include not defined Stacktrace:

If I run include("filename.jl") in the REPL normally, it works perfectly. But when I run it via rungame, I get this error message.