Cool. Now that I'm listening I think that bar with the change up works better on the forth bar, but it's cool this way too. Also, it could use a slight change up the second time around. Like this: Bars 1-3, first set: the main melody
Bar 4, first set: new melody version 1
Bars 1-3, second set: same as in first set
Bar 4, second set: new melody version 2 (just take the original melody and change the pitch of a few notes around)
OR you can keep it how it is but change the 4th bar to sound more like a "conclusion" if you will. So...
Bars 1 and 2: main melody
Bar 3: secondary melody
Bar 4: main melody with pitch change up on a few notes (as I said, make it sound like a "conclusion")
Just some ideas. Tell me what you think.