i wanted to like it, cause youre new and all. but i didnt.
objects were clustered, enemies were worthless.. for what makes a map good or not, look http://metanet.2.forumer.com/index.php?showtopic=2372 here.

now. in detail:
clustering: a nono here, dont place mines like you did, or gold like you did. you want your level to look and play well, and clustered objects are not the way to do that.
take time: everything in the map should have a purpose, and contribute to the level. lots of the objects in this map were worthless or too away from the map. this applies to enemies more than anything else.
your rockets were placed so that they were almost literally impossible to get killed by. most of your enemies were really hard to die on, and if they were dangerous, only to the degree an enemy should be.
playtest everything until it feels like a good level. play something by nevermore for an example of what i mean. go ahead. just type "author:nevermore" without the "s into the orange box at the top of this page, hit enter and see what comes up.
currently this is worth a 2.