When you finish the game you get a link to the final screen that you can share with other players.

However the link points to the wrong instance of the game.

I.e. i look at the scoreboard at 

https://html-classic.itch.zone/html/12121226/index.html

and the link of a game i finished there still points to 

https://www.johnayliff.com/games/seedship/index.html?mhCirajmrs.0-0.Arctica.1000... 

The sharer link works by encoding the game data in the query string (the bit after the ? in the URL). Games hosted on itch.io don't have access to that query string, so I made a page on my own website to display the mission report.

The link works if you link to the page itself on itch.io instead of to the iframe.

I didn't actually know you could get around the iframe like that with an itch game. Anyway I need the sharer page for the Android and iOS versions to point at so it's easiest to use it for all three versions.

I don‘t know how much control you have over the page containing the iframe, with a little javascript you can pass on query parameters from the page to the iframe