Had issues similar to the guy below, but after an unfortunate amount of waiting the game itself loads and seems to work, other than a separate issue I found. Might be something with old laptops and/or AMD components.
The separate issue I had with the downloadable version is that the resolution won't behave properly. There are only 2 normal resolutions available, both larger than my laptop supports on its screen, and the fullscreen doesn't adjust properly.
Editing to add: the main issue was text getting cut off even in Full Screen, and apparently the browser version seems to work fine on the same laptop. Probably some difference caused by the reduced animation quality.