Thanks everyone!
Yeah, I added a harmony part to that bit, but I think I got it wrong and made the harmony slightly too loud. I did this all by ear
Famitracker, from what I can remember, has a more complicated GUI. Rytmik is simple, and although it costs £7 (11 dollars?) its portable and quite easy to use once you get the hang of having to write each bar individually. The only real issue is memory (which is why its better for shorter tunes like this)
I don't have any intention on making any other 8-bit songs from the show, but I am writing a Dashie medley in Reason soon