It's nice when people compose their won pieces. And I ejnoyed the melody (it remindes me of a tv program I watched when I was a child).
What I can say is, that I don't understand what time signature it is. I also think you should do a bit more of a build up until you reach the louder parts.
(about the pathetique: Make sure to count all the pauses, now you were way off, and to make it evenly)