Ok, Next time I'll try a more fairy-heavy composition. Last two times I kept their numbers low because they get run down by Orcs and Trolls with speed quite heavily. If they outnumber the melee fighters a few of them will break off to specifically target the fairies. And Warlocks also do quite well against fairies because of the meteor spell. But indeed they do heavy damage so perhaps in high enough numbers I can take them out.
I'll also stop opening up the east part of the map all together. The level 10 demon spawn are already guarding that lair before the level starts though, so I can't go too quickly, army needs to be trained up to do so.
EDIT:
I finished the map. This time I ONLY opened up the right side of the map, and it played out completely different. Now I had time to train up - which also made fairies an option - and that training gave me enough strength to take out the east, and most of the rooms you needed to take over were there. My army was now also strong enough to take down the lvl7 party near the end without losses and I had enough traps to basically kill anything.
I accidentally won though, in a way that was not suppose to happen. At some point I think some white imps spawned, but I had walled of my dungeon. Because I was not yet near those imps to kill them, they tunneled into the white heart room from the east instead. I possessed an imp, quickly claimed to dirt past the guard post with the reaper on it and could kill the heart without fighting any enemies. I think I would otherwise have won easily as well, because my thieves where about to turn into knights and my fairies had rebound and that is a killer-combo.
My advice on this map is to reveal the lair, library, barracks, training and workshop rooms on the map with a 'reveal_map_location' command, either from the start or the first time a party spawns because you did not claim those rooms yet. This doesn't take any IF-commands, and it guides the player quite a bit in what to go for. In return, you could remove the red imp from the blue dungeon so that you can't mine gold without digging out.
The map is really difficult now if you go south or west first, and I don't know how the player is supposed to know to go east otherwise unless he does lots of sight-spells.
And look for a way to stop the imps from mining into the hearth room of course.
This time I enjoyed the map, and just before I won I found the secret-level special.
EDIT2:
I see you've managed to upload another file just fine. I got the same error message as you when I uploaded this file, so it must be something specific to this file. You could try updating it by replacing it with a .rar or .7zip file instead of a .zip. Or remove the BMP files from the archive to reduce the size in half. I opened map01242.bmp by the way, and noticed this screenshot was made when the map was corrupt. If you haven't used the 'fix map' feature on adikted on this map since then you really should because this map is much more likely to crash now.