The unoriginal features... You just revealed one. The music. You used features common to most RPG Maker users. If you want the game to actually be unique, you need to use your own stuff. Using your own music and your own battle engine instead of the ones provided is a start. Games with unoriginal content can be described as rip-offs.
I have seen games with similar styles out in the mainstream, but this one is very unique in the sence that it is in a school setting, so I think I will keep up with development. And as for unoriginal content, if you do choose to use other peoples work, I recommend making sure it isn't very commonly used and you give credit to the creator. In the case of Minecraft, they have many sound files from a rather obscure website, and they do (or used to?) mention that website in the credits.