Hey! I really like the screenshot and would love to play this game!
However when you export the game from Godot it will export two files, the .exe and a .pck file. You would need both to run the game. There is a really easy fix for this!
when exporting from godot, right before you hit the export button, there is a menu with a checkbox for "Embed .pck", and if you make sure that is ticked, then the game should export as a single playable .exe!
Cheers!