I think the octave choise is perfect (yes, I take the liberty to say that since you've only got about eight to choose from
)
Yes, this song must by far be your best this far; good mixing and instrument settings along with a working melody.
I'd agree with Grandma that it might have done well to have a break (read silence) in the percussion part, but moreover, I think you could have tried to vary it a bit. It just sounded rather repetive after the eight or so loop... then add ~ 32 more..
But others than that (and the obvious lack of an ending; but hey, you've got a nice intro!), everything is very well done
(Including the infamous reverb levels
)
A thing I might have done though, but this is just in my opinion, would have been to have the piano's sustain pedal pressed every now and then - gives a nice effect IMO.
And thanks for the aknowledgement - again, you're doing great
"I kören hörs de brummande busarna Björnligan och Gondolen"