My opinion is this track is about 25% done. You need to merge your tracks properly. The track is also not packaged properly. I also noticed .jpg files, which explains the large track size. You need to merge objects, convert .jpg's to .dds to shrink the file size. I didn't bother trying to load the track but I'm sure it is slow just by the amount of objects and the .jpg's. In reality it looks like you built this in about 2 hours. Spend the time and research what you don't know and add little details that will maximize the user's experience. You are on to something, but should have waited to release. Don't let these guys discourage you over a picture. What have they released?
Hit me up and I will show you what I have done to give you ideas.