I tried this map about 4/5 times on hard, lost after ten minutes of playing each time.
I then decided to try on normal, tried about 5 times again. Lost again, only the last time after 20 minutes or so.
I am an EXPERT at single player, I finished the military campaign 3 times, last time on very hard, and I have also played over a hundred(!) invasion maps.
This map is impossible at normal or harder difficulties, unless you spend a day trying to beat it maybe.
Playability : ZERO, sadly though, the minimum is one.
I'll explain by telling you some details about my final try(normal). I had a VERY small square castle, it had 2 layers of stone and one large gatehouse. If I builded it bigger it was not defandable anymore. I coulnd't grow wheat so I ran out of food, multiple times. There were about 4 fires in fifteen minutes, we all now what those do in a small, packed castle. I got plague as well. There were non-stop large invasions, so I couldn't get any resources or build more farms. ( I had 4 cow farms).
Losing 10 times because the map is impossible sucks!
Balance : The military and economy where impossibly hard, no balance what so ever.
Creativity : The keep was nicely build, with walls added to it in a nice way. But the starting castle was rediculously small, with far too few buildings and defenders.
I would have given it a 0, but since that ain't possible I'll give it a 1 for the keep.
Map design : the map looked ok and had some nice ruins.
It bothered me that I started with 100 stone, I'll explain :
The landscape had boulders and ruins for stone, why would anyone bring a hundred friggin stone blocks to such an area??
Story Instructions :
There was a very short 'story', which basically had nothing to say. It had 2 wrong spelled words, and an overall poor grammar. It was in no way supported by the scenario, except ofcourse that the Rat and the Wolf indeed attacked.
Advice for the designer :
spend at least SOME time thinking of a good story and it might be nice if you even bothered to playtest your scenario's before submitting them here!