...Well, you'll probably need to install HoMM to playtest my game
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As your scenario is right now-
I'd rate it a
0 For story

Normal to Hard for challenge... at least for Average Skilled players
And as for innovation--- If it had differences in the areas, I would rate it higher, but as this is the first map of its kind, I'll rate it a 5
A few changes would make this a stellar map

As it is; it's a fairly average Battle Map

A new idea in the realm of battle maps (or so I suppose) but fairly standard in its implementation