What's the point of giving a constructive comment when you'll never finish it anyway? Still a honest move to say it though.

People are more likely to take the time to play and then review your map with constructive criticism if it looks like its worth their time. (i.e. the map is finished, the picture looks good, and the map looks like you have put a lot of hours into it.) As of now that does not seem to be the case. I would love to give you positive feedback, but first please develop your idea to near completion and then post here.