I'm sure that most people, like I at first did, are wondering how useful a game could really be. Answer: Very, very useful. I think Vim Adventures was a way better headstart for me to learn the Vim style of thinking than pretty much anything else could be.
Start by deleting that crap, then run $ vimtutor until you are comfortable, read :help carefully, try your hands on simple tasks first then augment the complexity… after a couple of months you'll be as productive as before or more and, maybe, ready to do the actual switch.
Try vimtutor before you begin with these plugins. You'll learn a lot of basic motions and also get the feel for how to speak vim, combine motions with count arguments, etc.