This variant of the Tiny Wings Day Theme is publicly available on andreasilliger.com, the developer of Tiny Wings' portfolio. You can try to download the soundtrack from here, but the link to it will only work on iOS as far as I can tell, and needs to be slightly altered for it to work. The universally working link to the download is provided below.
Download Link: http://www.andreasilliger.com/download_tw_theme
Alternate Download Link: https://krakenfiles.com/view/NMq5wcmZMu/file.html
