This is a great adaptation, and very accurate.
However, it isn't properly much of a game: while the in-game text at the end talks about the "strategy" involved, the reality is you mostly randomly click things until the game makes you do the right thing. There is no contextual hint or clue about the world around you until you accidentally stumble on a town that tells you to go East. (Of course, the game also forbids you click any other direction!)
There really isn't much choice inherent in this game, except terrible choice that results in death or randomly clicking more directional indicators. I remember this game, and I enjoyed the nostalgia effect of finding this adaptation.
It is very short, so you should try it if you are curious, but I wouldn't really recommend it to people who didn't already remember Dragon Warrior and enjoy it. (I can still remember the geography of the game!)