Definitely, the difficulty level is veteran-hero. I had so many dragons... I don't even remember how many. The trick here is that after a few hundred, they grow very quickly, and you simply don't have time to destroy them before their numbers exceed ten thousand.
I had about the same amount, if I'm not mistaken. Not that few)
A similar situation. I understand that if you lose even a little time, the scenario becomes almost impossible to complete.
Человек – продукт своих мыслей. Ибо он становится тем, о чем он думает большую часть времени! Все будет хорошо! Верь в себя, и ты пробьешься!