NIGathan has released the beta version version of what he calls “NIGathan Shootuh.” It is still in the very early stages of development so don’t be surprised if you find something missing.
Features:

Slow mo meter
lives system
pause menu
shooting
wall collision
poor enemy collision, to actually detect you have to make sure that the x axis is lined up […]

Deniska’s KETM (Kill Everything That Moves) for PSP is a great game. jahsg has released a Star Wars mod making the game even better!
Download: KETM Star Wars Mod from QJ.net
Download: KETM v0.9

Like Pong? Well a_noob, on the QJ forums, has released VSHPong. VSHPong is a plugin that allows you to play Pong anywhere in XMB. As an additional bonus you can run it as a game prx and play it during a game.
Changes:

On/Off feature
better ai vs ai

Installation:

Make an seplugins folder on the root […]

Deniska’s KETM (Kill Everything That Moves) for PSP is a PSP adoptation of KETM by studio-grey/badblocks, a fast paced tyrian style 2D shooter.
Features:

4 levels with different environments, music & bosses
1 bonus level
15 enemies with unique attack patterns and adjusting hostility
7 primary weapons
4 secondary weapons (rockets, laser, bomb, rotating shield)
2 mods: original episode1 and 1941 mod […]