I just wanted to mention that the text on the store page mentions a Linux version but the official platforms listed don't. This may make it harder for potential Linux players to find the game because if they filter by games with Linux support this won't show up.
No, the Linux version is it's own version. The Linux executable is packaged properly right now and it works but somehow you have told Itch.io that there is only a Windows, Android; and Mac version because that's the only platforms listed. Most likely just have to check a box with them although I have never published a game with Itch.io. The issue currently isn't that Linux gamers can't play Ripples but that if they go by the platforms listed by Itch.io they may think that they can't because no Linux version is listed.