JMB9: So it just arrived:
*
GOG Announcement *
GOG Product Page ... but currently for
Windows only ... I hope this will change soon!
I tried to contact the Devs before incl. a bug report - but only got an automatic reply ...
Maybe GOG could provide a direct mail address to reach the Devs and
could provide an info about the missing ports for GNU/Linux and macOS ...
If the other ports are already included and it is just missing info on product page,
I would appreciate if anybody could give that info in this post!
I just opened a support ticket ... maybe GOG could provide some info soon or at least
make this discount available to those waiting for the missing ports - as this is not
the gamers fault.
I wrote them this summer before. I was checking price history on the Kingdom Rush series. The games haven't been on sale for years on gog at that point. I asked them to please put them on sale. They replied and said they'd forward to marketing. The very next week, during the summer sale, all the games were on sale. They're now in the regular sales rotations. Maybe it was just an oversight. So they do read those messages. Perhaps you should write them again.