I've not played a typing game before that wasn't designed to teach typing.
Epistory is definitely not here to teach you typing. In fact, if you're not a plus 50 wpm (and preferably more like plus 80 wpm) typist, I don't recommend this game.
I mean sure, it has an origami girl on a cool origami fox trotting through an origami landscape that unfolds before your eyes. And you can change the landscape - spawning trees or flowers or removing logs by typing their names. And the creepy crawlies coming toward you every so often are easily banished with a quick key word or several key words. And you even get skills to take out multiple enemies at once, and can manage boss battles where a dozen things are heading toward you from all sides and you're typing and owning them with your skills and your three and four and five letter words and then it hits you with nocturnal and polysyllabic and hyperglaecemic and...
Beginner typists simply aren't going to survive.
It was fairly short on the story part, and the control mechanism for the fox is a bit irritating, but for those who are fast typists, this game will give you a nice challenge.