Looks like Hudson is getting in on the PSP Minis initiative. Their iPhone tower defense game, Elemental Monster TD, is coming to the PSP.
Germany’s USK rated Elemental Monster TD Portable and it appears to be a port of their iPhone game. This game is actually based on a Japan-only trading card game for the DS called Elemental Monster. The game sticks to the source material as you can see in this tongue-in-cheek developer’s “diary”.