Is that or s similar script somewhere public? I'd like to do the same.
Also, you can give it a SoundCloud user or a playlist, and it'll download it all. And if you use --download-archive, you can re-run it later and it'll only download the new songs.
I have a cron with no scripting, just the youtube-dl command, that pulls down new videos from an YouTube channel every week. It's awesome.
I used this one to download all of my soundcloud likes and some tracks/likes of other users, was pretty fast/painless