There are a couple of problems that I see. First, unless not is the same as if. Second, you have an undefined subroutine in isBad.

#!/usr/bin/perl -l

use strictures 1;
no strict 'refs'; 
use Devel::SimpleTrace;

print my $message = 'Congrats' if defined ${'result'};

my @badVals; 
foreach my $val (my(@vals)) { 
    push @badVals, $val && next if isBad($val);
    print "$val is a good val";
} 

sub isBad {...}
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