Answer 1

If you want people to test your maps, I highly suggest joining the #dustforce IRC channel instead of uploading maps to atlas. People are generally willing to test your maps and give you feedback if you ask. Here is the link: https://www.reddit.com/r/dustforce/wiki/irc

I reccomend you try making shorter maps at first with maybe a general idea or theme to them so you can learn how the editor works, its quirks, camera work, etc...