Open a terminal in that folder and run the main executable file (which has the name of your project) - in this case I think you'd do:
./WestTown
I looked in to trying to get Construct to export a shortcut or something double-clickable to make it easier, but it looked like the only way to do that was with absolute paths, and Construct doesn't know where you'd extract it. You should be able to set something up manually though.