It's a homebrew game.
You can run it on a psp with 3.03 firmware only if you downgrade it to 1.5 (it will also run under the custom firmwares of course).
Here is a guide on how to downgrade if you wish to do so.
This is a really cool piece of homebrew, I disagree with the author putting down the authors of 2d homebrew games though.
The red line moving between Mario's legs when he jumps is a little odd
