The concept is creative, it reminded of "The Typing of the Dead", but with movements, nice!
The only flaw for me, it is the usage of the mouse for the view, indeed I found really hard to be efficient in the game, because I couldn't have all the time my two hands on the keyboard. I know it is a part of the concept, but I think with a "lock" system on enemy like Dark Souls, where you can switch target with a non-letter key like space bar, so with this it could have avoid to struggle with the mouse & have the two hands on the keyboard.
Overall good job!