First, I would just like to say that I really love this game and I see great potential. I would like to give ideas where you could bring the ants and the challenges.
1. desert. you could introduce the Cataglyphis an ant native to desert environments.
2. City simple and easy.
sorry I didn't write a lot I just wanted to say something quickly. also i year or 2 ago I left a thread saying there should be a level where all the environments combined into 1 giant level.