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I would have been glad to plug it up - but scout heroes were popping up where papa needed them :D , and they aren't infinite either..
Furthermore, it's advisable to graze with scout heroes within reach of the exits so that papa doesn't need to buy heroes in the castle during his travels.
And naturally, drive away enemy scout heroes doing the same thing.
Here, Fortress rules, especially the red one. Flies are fast, roam the swamp without penalty, you need to run scout heroes at them. Lizardmen are tough, they survive well under enemy archers and shooters.
Aside from flies, there's no need to build any other units. And for other towns too, there's neither reason nor money to build more than 4 dwellings.
Conflux absolutely rules, still the same speed boost (pixies) + firebirds immune to shooting and eventually magi. Tower is decent due to golem resistance (recommended to upgrade) and the mage bonus. Dungeon due to warlocks, vortex, and speed boost on upgraded harpies.
The rest are somewhat worse.