Tips on how to improve my song (what do you think)...?

So, I started making music as sorta a joke for my design stuff (pictures and video) but then I actually sorta liked making music as sorta a hobby or something to do in my free time. I thought I might as well at least try and get better at it :P http://www.youtube.com/watch?v=PL86gwpcIGk Just tell me what to add, fix, takeout, improve etc. You can say you hate it or whatever cause Im mostly doing it for fun :P