Savenge moon, the Sci-fi tower defense mode title that’s available on PS3, will be coming to PSP soon. The title is being built ground up for the PSP and will have new weapons, two new species along with two sub species, twenty new Imoons, new player controlled events for campaigns and a few more additions.
There hasn’t been any release information including price, release date or distribution yet. I’d take a shot its a PSP Mini title based on the fact the PS3 version was downloadable as well.
(Source: PlayStation Blog)