Seems interesting, but is it a tad… insensitive to quad-amputees? I know it sounds a bit weird, but there are cases out there (There was a news story recently on BBC news about it all).
Couldn’t this be seen as mocking a quad-amputee?
I might be mistaken but you know, better to be safe then sorry 
The game does look cool though, and I’ll be keeping my eye on it!