I recently needed to download an Android application from the Google Play Store to my computer and found gplaycli.
It can be installed on Debian with apt (make sure to use --no-install-recommends or you'll get hundreds of new unneeded packages).
Download did not work at first; I only got
$ gplaycli -d de.kemmerich.android.shift Error while downloading de.kemmerich.android.shift : 'Server busy, please try again later.'
The solution was to put some Android Google account credentials into /etc/gplaycli/gplaycli.conf. Then I removed /home/cweiske/.cache/gplaycli/token and tried the download again - it worked.