Reviews with constructive feedback are appreciated!

Well, I started learning music two weeks ago.
This neat program LMMS(linux multimedia studio) has been pretty nice so far, it's like a freeware FL studio.
Anyway, I've been practicing with short loops, and a friend of mine asked me to extend the chiptune one.

So this was the result.
I know it's not perfect, but then again I rushed this all in one night so I could do my math homework today without distractions.

Enjoy, and stuff.