It worked. Maybe you should zip into a .zip. It comes preinstalled with windows and linux, IDK about mac though. BTW, I like the game. Your graphics are really nice. Also, you might want to spread out the spawning points. (Maybe you did and I just didn't get that far)
Thanks. I had the same issue, but I found a solution. Go to Edit -> project settings, then click on Player -> Publishing Settings, set Compression Format to disabled and try building again. This setting only shows up in HTML5 mode though, so you will have to change it after you change the build platform.