First of all, there are bugs in the script! Try to open it with the editor in debug mode, and you'll find at least two problems.
As far as the map design goes, I think it does not look too good up close, since the forest and cliff textures abruptly change into the "normal" ground. Try to find textures which make for a more natural transition!
The map has several balance problems. The smaller ones are the natives and treasures, which seem to be placed completely random, so players can get big advantages/disadvantages there. Usually, easier treasures should be placed closer to the players and harder ones further off. And if the natives are close to one player, he has a definite advantage. (Btw, I thought Tupi were not exactly what I'd consider fitting for a snowscape like this.)
Player placement offers another problem. One player can be placed almost directly at the trade route, with two, maybe even four trade posts in his immediate vicinity, which makes for a HUGE advantage.
The worst part are the three herds of huntables/herdables, which always seem to show up at the same places, no matter how many players there are or how big the map is. A player can start with two dozen cows or with no chance at food whatsoever (apart from the starting resources), depending on his starting position.
The hospitals were a neat idea though, and the two trade routes could make for interesting battles, but the balance problems are just too big here, there's not much fun in playing this map.