Unfortunately, you have to accept the fact that it is very hard to have an "original idea" nowadays. Your map was rejected due to the lack of execution on both the build and parkour. It is 100% fair game for somebody else to take the theme
and portray it successfully, unlike the first time. Not to mention you guys have talked it through prior, so you knew exactly what was going on (which is the right thing that Sophia could have done anyways).
There are plenty of other themes you can easily execute and call it your own as long as they own up to ManaCube's expectations.