I used to think that increasing the map size would have a good effect. But I was wrong. As a result, small units became even smaller, both visually and technically.
Then I used arenas of 14x14.
The standard map turned out to be better.
Reducing the speed only prolongs the game, and in essence, you'll have to rework a lot of things, as the tactics of the factions will change.
It's strange to say, but Nival managed to create a good balance where the game is both fast-paced and interesting.

Added after 47 seconds

Well, it depends on who you ask, but I, for example, like the idea of simply adding more obstacles to the arenas!

The obstacles are configured so that the minimum number that appears is always 0.
But you can configure it so that if they do appear, there will be more of them.