It's an alright map overall but still, some aspects could be fleshed out. Most notably there are two problems; A lack of cover and the unannounced enemy spawns.
The main area is a huge sniper sightline (not to mention the otis spawn too) and after killed, enemies continue to just pop in without any indication(lack of a sound, or a sprite, etc.) This is especially frustrating because when a player is trying to push through a choke point, they usually get gunned down by one of these two (or both) from behind. The enemies need to be communicated better; When they spawn, when they stop spawning, etc.
Gameplay problems aside, this is a decent and a straight forward map; Get in, shoot stuff, get out. Pretty alright for a beginner mapper