The game can be played directly on your browser (chromium-based browsers works best) at https://matteolecuit.github.io/III-ad/
You can also launch it on your computer (Windows/Linux):
Execute III-AD.exe in the builds/windows folder
Execute III-AD in the builds/linux folder
If the game seems blurred, it's probably because your computer scale is > 100%.
On Windows, hit the Win key, type in display and change the scale to 100%