OK! I have downloaded the new version on Linux and played it all the way through, hooray! You are correct that the executables need marking as executable -- this was fine for me to do by hand, but it will stop the game working when installed through the itch.io desktop app. Also, when running the game in a window, the game hides the mouse pointer and disables switching away from the app, which is a bit disconcerting and rather defeats the point of running it in a window :-) But it does run successfully now, and I have played it and enjoyed it on Linux; nice work!