Just a heads up- on mobile (Firefox on Android) I can press to create the little thumb stick graphic, but the duck does not actually move at all.
I know you can't test every use-case, especially for a browser game, but still wanted to let you know.
I had the same issue.
https://gildedgreen.itch.io/spare
Just popping in to echo that I'm having the exact same issue. Windows 10 Home. Like the other user, I have Unity installed, but I don't know if that's a factor or not. The game looks gorgeous!