on strawberry 5.26 I have modified your program first lines as..

use strict;
use warnings;
use feature qw (say signatures);
no warnings qw(experimental::signatures);

# use Win32::Console::ANSI; # nothing change if loaded or not
[download]

but I still receive the error Invalid attribute name r0g0b0 at rgb_palette002.pl line 23. which is the line

print colored(text("r${r}g${g}b${b}"), join(' on_', fg($r, $g, $b), "r${r}g${g}b${b}"));

I also changed the TERM env var from dumb to not dumb (used to work) but still receiving the same error.

L*