To supplement Corion's thought on the @slides array, I think the module author assumes that you might create your own Perl data structure.

Instead of your "for" loop, just try to create a single slide with some dummy information:

$ppt_ref->add_text('Here is my title');
$ppt_ref->add_text('This is the 1st line of my text');
$ppt_ref->add_text('This is the 2nd line of my text');
[download]