Keep in mind, different people different opinions. Everyone can say whatever they feel like about your map but it's up to you weather you care about it or not. Now to the point. This server's standards have changed over the years. You may have seen pixel art maps but they will not be accepted anymore. So basically anything pixel art related, even if it's 1 build, gets thrown out the window. What they mean by "build" is something very particular representing your theme. For example, if your theme was "sheep" you would build a sheep, a fence, a valley... That would be your build. Now I cannot say much about the parkour since I have not tested it, but keep in mind that if you have floating parkour that is most likely going to be a minus to your map too. (changed with the pixel art maps, they don't like that anymore)
Nonetheless, good luck with your submission :)