Me & My Katamari

[LunaMoo]

Hmmm, I wonder is that your first time using cheats in ppsspp? I'm thinking maybe you don't know how to activate the cheat?

So - cheats have to be activated in system settings first, then on the pause screen you'll see a new option called "Cheats" which will open cheat menu, then just "tick" the cheat to activate it or if there are no cheats on the list, on pc at least there will be an option to edit cheat file which will open the correct ini file for the game where you can add cheats.

Slight edit as noticed one of your screenshot mentioning version 1.2.2 and confirming it's US version of the game as well, would recommend updating to latest PPSSPP version since it fixes some other glitches.
Also what I hope should be obvious, but maybe it isn't ~ if you did activated cheats properly, make sure to only use the cheat without "[Disable]" in it's name, if you would activate both, the second one as the name points would disable the first one and have no effect on game. I would rather think you just not enabled it at all through maybe our cwcheat support thread is not soo newbie friendly and cheats are disabled by default.