Yeah, Balue's theme is actually fairly popular. I hear it a lot in youtube videos, it's possible he just liked the song.
Even so, the key to something becoming popular is usually for it to become an Internet phenomenon. If he ever does one day play door to phantomile, Klonoa could easily see a boost in popularity (though, personally, I feel like Cryaotic would be better suited to play such emotional games. I would die of happiness if Cry played DtP)