Thanks, thereisnotry!
I find it interesting that you feel the right side has the advantage here. I feel that left-side shooters have a better vantage point to snipe on gambit than the right, therefore forcing right to cross over to engage left and take a bit of a beating in the process. Meanwhile, the left side can get into gambit with a bit more protection against right-side shooters once they get there.
If I was to field a melee squad, I'd prefer the left and make a dash for gambit, then use the narrow tunnels to force close-range engagement. If I was to field a ranged squad, I'd likewise prefer the left for better lines of fire on enemies trying to collect gambit.
But I might be backwards about that; I've never been the best in actual gameplay.
Incidentally, this is a map where I really would like to add a new terrain type: the spray from the waterfalls should block line of sight (or add a concealment modifier), but allow movement. That would, I think, give the map more balance with regards to shooter squads.
In any case, I'm really glad you like it!