Master of Horizons

If I make red weak and everyone else stronger, it will be an imbalance, and it will be disadvantageous to play as red.

No, it won't. We're not looking for advantages; we want challenges. 😉 Almost any imbalance can be solved with a mentor (incorrect development + imbalance = game over). Antik is right in this: "Basic mines in the weekly path and with inadequate protection + random buildings that provide bonuses" – this shouldn't be the case. As for the landscapes, I don't care at all (there aren't any in the third game, and the game hasn't lost its relevance because of that) – the most important thing is the battles. If it's too easy, most people won't play this map a second time – replayability is a must-have.