You mean the itch.io app? I think it did download the game (if you somehow played the web version via the app, it would be less smooth too).
On my computer, in itch.io app, Library -> installed items -> Bringris -> [cog icon] -> "manage" -> "show in file manager" and you should see the files on your computer, and you could try running it directly, or see if you have a file "bringris.ini" that you could try to delete.