I really like this map; it looks great! I do have a few comments, though. The nat is really far away from the main, and the middle is more like a really long choke than an open battle area; it wouldn't be easy to send a lot of units through, and they could easily be picked off by tanks or such on the cliff walls. Maybe this was your intent, and if so, it could be a lot of fun, but may be slightly (extremely) imbalanced.
modified by Corvett

imbalance is the point of the TSL competition, buddy.

One point of Excel's rules state that there should be at least one passage where a maxed army may move with some ease. This is not happening here. Fix.