I think I'll add you to the New Authors! list because of this map.

The design is very good, the enemies only pose a threat when they need to (in other words, when you're going for the gold) and overall is a pretty solid level for someone who is new.
there are a few things I'm going to nitpick though. First of all, the chainguns were not needed. Even when going for the gold outside of the castle they didn't pose any threat at all. also, you really only needed one, and maybe if at the top where the exit switch is you had used one-ways for the walls instead, then a chaingun might have posed a threat to the ninja when going for the gold up top and getting the exit switch at the same time.
also, stacking gold, one on top of another, isn't really a good idea. For some reason, the gold object makes the game slow down more than any other object when there is an excess amount of it. This can best be seen in condog_111's map The Hungry Prospector [nmaps.net].

Other than that this map is great for a beginner.