Sorry for that. Unfortunately, we didn't have enough time to test on other platforms apart from Windows and Web. We are currently working on this problem and will let you know as soon as it gets fixed. Thank you for letting us know!
I'll give it a play when I get off work. Run the command `sudo chmod +x GAMEFILE` If you run that command before uploading it, future users shouldn't have that issues.
While developing we thought that the game won't be fun because the mechanic seemed too simple. I am glad it turned out to be fun and that you also like the art. Thank you for the compliments.