[@NekoMizu]
The invisible wall idea reminds me of some of the concepts I use with my characters' various magic systems, though it's still quite different and I think what you've done makes sense for something that works like an MMORPG with a lot of its mechanics. I didn't know that people had to accept matches, but that's interesting. I like the idea of having a mobile phone work as a hub too; I don't know if an anime has done that explicitly before or not but it's clever and fits the setting you're going for.