This looked to be a scenario as I like them best. You get a few decades to build up your economy and defences in preparation for the coming invasions. An interesting landscape with multiple defensive opportunities, like building outposts and making use of height advantage and other features in the landscape.
Also the limitations in trade and building opportunities make for some interesting choices.
But for one thing: lack of wood.
JeDak warns wood will be scarce later on, but he forgets to tell 'later on' is when your first load of planks is on the stockpile. The tree fungus detroys about a third of the trees, an event which is repeated a few years later. Combined with the fact the remaining trees grow so far from your settlement the woodcutters need about a year to return with a fresh supply of wood, this makes for an unbalanced map in my humble opinion.
Instead of interesting this feature makes the map awfully boring for me and instead of an opportunity to build something grand over the course of 25 years, you have nothing to do but endlessly wait for building material, including stone and iron.
I'm not saying the map offers no challenges this way, but not to my taste.
I'm of a mind to play the map again after I have removed the tree fungus event from the scenario. Fortunately the scenario isn't locked!