I'm going to be bluntly honest with Super Sprita here;
Going off of how the project is composing itself thus far, I'm having reduced faith levels of completion. If anything, I'd advise AGAINST using Game Maker. If we do somehow finish using this medium, all work can be for naught due to the fact that there's a GM Decompiler floating around out there. This could essentially end up bad.
What I suggest doing is going around for another medium of creation for it. I'm sure Wichu might be a good person to ask for advice as he is experienced with the subject.
I'm only saying this because I don't want this to suffer the same fate as 99% of all other fan game projects out there. I've actually started putting serious thoughts into storyline and other details and would hate to see them all go to waste due to sloppy beginnings.
Also, we need to amass a true staff. Two people tackling an entire project is suicide. I've got a few unfinished projects of my own that despite all of the months and hours of planning, still found themselves slapped with a big 'ol HIATUS label. In fact, all but one have been cancelled. Having only me being able to do quality scratchwork puts an unnecessary amount of toil on my plate and especially since I've got Brawl, It'll be hard to keep up.
I only mention these to attempt to put the project back on course.