well at the end of DtP, Huepow tells Klonoa's it's time for him to go back to "his Phantomile"
it seems Klonoa's real world may be a parallel world of Phantomile. that could be why Klonoa kinda knew his way around the Phantomile in the first game. perhaps Huepow didn't alter his memories of the land, but of the people that live on the land. i think the world in Klonoa Heroes is his real world, as it has parallel characters of everyone in Huepow's Phantomile, except Huepow himself. my theory is maybe Huepow's Phantomile is where the only Moon Kingdom is, and Cress uses the dreams of everyone to shape the world. perhaps it also shapes other worlds, that's why it's so important, and also why there would only be one of it and one Huepow.
but then again, is Beach Volleyball takes place in Klonoa's Phantomile, then that would mean there IS a parallel Huepow.
maybe Klonoa's Phantomile is a parallel world of both Huepow's Phantomile and Lunatea, that would explain why Lolo, Popka, and other Lunatians are there.
i haven't played much of Klonoa Heroes or seen much footage, but if there's only 1 moon, then that could mean there's an entirely different Moon Kingdom in Klonoa's world. maybe Klonoa didn't meet Huepow in his own world, but met him in his Phantomile.
idk im kinda making this up as i type >.>
just a little theory i put together the moment i started replying to this XD