Little remark (at first glance): It would be nice if you warn users at startup if they are on unix and not have the 'play' command available.

I've glanced at CPAN (yes, it's still your friend), and I saw a few possibilities.
-Audio::Play plays sounds on both unix and win32, but it cannot play WAVs, only .au and .snd formats, which I don't know.
-Audio::Play::MPG123 plays mpegs cross-platform (tested on win32 and linux).

There are many more modules to convert and change audio-files in different formats. Search on Audio to find them.

Hope this helps,

Jeroen
"We are not alone"(FZ)