Hey Bibendus, remember me from WC3?
D&D map coupel years ago...
Its good that you moved on SC2.
Currently theres a huge list of game genre which I could call endangered from WC3, somewhich were pretty popular back then.
For HiveKeeper I suggest you look at the Miners map in WC3, its a multi-race variation of digging maps, the goal is to run away by digging through the map before player controlled spiders catch up to you.
Also, the map should precise that you can avoid making walls between rooms, a lot of newbees bump harshly on that and quit.
If you're interested in making another map, there would be a remake of the Vampire Hunter maps, the original Force Majeure Vampire Hunters never got back despise being very popular. It cannot be played since the script update, a lot of people tried to revive it but failed.