Hi, a few weeks ago, when I started to play the game and wanted to run it, I looked at the game page and saw there was no custom theme. Since the game is really gorgeous, it's a shame not to have a cool theme so I tried to do something. Sadly the theme system changed recently so it not possible to get that result anymore but maybe you'll get some ideas from it.
Default
Custom (the gif ship is a bit too much but it was a good test)
P.S: The game name is Flinthook not FlintHook (with a lower 'h', same for Goldfeathers) 👀
Amendment. The site got some theme features brought back so it's possible to get a cool layout again. I made roughly the same changes than for the last time. I hope it'll make you want to improve the theme in one way or another. 👍
Default
Custom (still not sure for the gif ship 🤷 )