This was pretty fun! Reminds me a little bit of the Jedi characters from Battlefront II (no, the other one) where you have to keep killing enemies as your health runs out. The dash attack feels really good - although binding it to the mouse button is weird given that the mouse doesn't play into the aiming at all. I keep trying to move my mouse in the direction I want to go instead of starting to run in that direction.
I wish the one-handed bit played into the gameplay a bit more - the "only one" theme isn't very prominent.