I just purchased Botanicula through the itch.io app on debian, but when i click launch it simply opens my file manager, showing the new directory 'botanicula' containing the single file 'Botanicula.air' which I believe is an adobe file extension. What do I do? Many thanks.

So I managed to install Adobe Air on Debian 11 (no small affair) but then receive the message in the screenshot when i try to use it to install Botanicula.air. I'm very sad.

Maybe try using wine to run the windows version