That’s already enough time to create your art piece, I hope there will be no extension since it will be unfair to those who submitted their art work in time. If you are is already available, better to submit it now so you can have the advantage of being the first and unique art. Anyway, you still have time to prepare for it and make it perfect, I expect more participants for this round, the competition is getting tougher.
A month of work for creating an art must be enough already but for those who are late to see the thread, they only have a limited amount of time left and it could affect the quality of their art works but they are lucky if the team will give them an extension. Those who are early must not worry because maybe those art who submitted late will have a resemblance with the other art works or in other words it will not be totally unique anymore (like you said).
Contests like this from Roobet are not really new and many people have waited and prepared their new talent for this. That makes the competition bigger than ever but isn't it more challenging?
Of course, The more time they have is the more time they have to think about the art they are making and conceptualizing it to be unique and have a quality that can satisfy the artist. The concept behind the art is I think one of the most important part of this contest since it roobet do this kind of contest for many times now and we have saw various concepts and themes that had won. I don't think a repeated art theme will still win the first place repeatedly that's why I think doing back track of previous winner and thinking how they won matters in this contest. The art is skill based and it will all depends on the artist, We can't blame them if they are really good or not but I believe that the uniqueness is one of the things that artist should really put their time on aside from the art making itself. I guess it's a one whole process which the artist can put their time on.