<a href="http://www.edepot.com/game.html" target="_blank" >Edepot</a> have released a new homebrew game for the PSP, heres more detail.
AgenaWorld Ver 1.0
This PSP homebrew game is a little like the "HomeWorld" PC game.
You command a ship and there are enemy ships and asteroids
here and there. The enemy ships shoot at you and you shoot back.
The enemy ships hyperspace in all the time to stop you from
clearing the asteroids, which you need to do in order clear a path
for your big invisible mothership to super-hyperspace to the next level.
It has a radar of the huge space you can travel in. The levels get
harder and harder but with limited mission (more missions
for people who donate and register). If there is enough support,
two player PSP to PSP may be added.
This is the first release. It is a reworking of the Ceres ("Asteroids on Steroids") homebrew game, with expanded dimensions (download that one from the same site to compare). The graphical routine needs work still, so sometimes if you get stuck in a corner, try hyperspacing out.
Download here --> http://psp-news.dcemu.co.uk/agenaworld.shtml