Hey, of course, I'll try help! And I'm in the same boat in the learning. ^^ So. The leit motif thing: well, the Jam organizers did leave a few videos as pointers, very useful stuff. The main idea is that a leit motif is a music phrase that, repeated enough times throughout a song, you associate it with a character or a franchize.
The best example I can think of is of course anything made by Hans Zimmer. They are very long songs but there's a part that the theme keeps coming back to. That's the leit motif.
But that also means, it's almost exclusively the work of the melody line. That's what usually sticks with you - and sticking *is* the objective. You could say the line patterns become a marketing strategy of sorts. To such effect, later on you will remember that phrase in your head, for hours/days/years to come. Think Mario Bros and you immediately remember the first two-bar sequence in the first level.
That's why your theme is at a disadvantage here. I'm thinking, if you could add it a melody line (hopefully something catchy), this could turn into a leit motif no problem, however. ...Hope any of this helps :)