I really like the concept of the game.  I think the problem with the controls is that holding the mouse button seems to cancel the stab, and then there's also a slight delay for the stab.  But with a few adjustments, this could have really great game feel and it would play really well and be super fun.

Edit: I noticed too that the game saves your progress when you return.  Nice feature.

Really good adherence to the theme! I would have seen some air movement through the sword, it was a little hard to control.

Nice game here. It was a bit hard to control though.

The game mechanic was a lot of fun! Couldn't get past the third level though.