I saw semi::semicolons, so I figured the rest of the language could be changed some how as well?

Semi::Semicolons take a non-Perl program, translates it to Perl, then runs that. Feel free to create your own programming language and translator just like Semi::Semicolons did. Then, all you need is this:

package MyLang;
 
use Filter::Simple;

sub translate {
   my $mylang_code = shift;

   ...

   return $perl_code;
}
 
FILTER { $_ = translate($_) }

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Note that ref[foo] already means something in Perl. (It means the same thing as ref( [ foo() ] ).) So you're new language is going to have to change that too.