Jett has released a new game made from Lua for the PSP, heres what he posted:
To use, copy script.lua (along with the rest of the files) into your PSP/GAME/luaplayer/ folder. Feel free to use one player.lua instead (must be renamed to script.lua) if you don't have someone to play multiplayer with (warning: it gets so fast that you can't miss after a while thus making it's replay value extremely tiny)
My first game was a one player version that is top down instead of side to side. It's attatched if you would like to check it out (I was going to implement it into the menu I created for the multiplayer version but due to lack of motivation I didn't)