You can hack the plugin very simply. Look for this line
$args = array( 'numberposts' => $soupnumber, 'no_paging' => '1', 'post_status' => $posttype, 'order' => 'ASC', 'orderby' => $postorder, 'ignore_sticky_posts' => '1', 'category' => $soup_cat);
and change it to
$args = array( 'numberposts' => $soupnumber, 'no_paging' => '1', 'post_status' => $posttype, 'order' => 'ASC', 'orderby' => $postorder, 'ignore_sticky_posts' => '1', 'category' => $soup_cat, 'post_type' => 'page' );
I’ll consider building this into a future version of the plugin. I have created an issue in Github to track this request if you want to follow along.
