I just gave this game a quick try, and I couldn't get the game to respond to any keypresses. The mouse worked fine, though. I'm using Ubuntu 12.04, and I made sure I have Python 2.7 and Pygame 1.9.1.
From what I could play, the game seems a bit spastic and unfocused. I tried shooting things, but it didn't seem to affect anything but the collectable jewels. Also, am I supposed to be able to collect those with the mouse cursor too?
If I can figure out how to fix the keyboard stuff, I'll try to give fuller feedback.
Hello!

Well /:, first: i'm going to try to understand your 'Re' as well as possible

Well.The game has no keyboard controls /: you need to use only the mouse. I also have ubuntu 12.04 and the game works like on windows.But..,what do you mean with unfocused?, the game graphics seems bad on your computer?.
When you shoot to a monster you need more than one bullet to kill the enemy, unfortunately i forgot to put something like a sound to indicate that, I'll put it in the next version

and yes, you can collect the diamonds with the cursor or with the character.
I know the game is not perfect but is my first game on python and i want to launch more versions with new features and monsters ):.