First of all, I like the player character and his animations. And the movement is flawless.
As for the rest… the thing is, the gameplay is extremely repetitive. There's no level design to be spoken of – it's technically just a long corridor, and the layout doesn't change between levels.
The combat, which is the only thing you do in the game, is very unremarkable. Just one kind of an enemy, one repetitive pattern. The best approach I've found is to come close, bait them with your first hit (which always damages you because the ghosts are a lot faster than you), then stand as close to them as you can without being hit constantly and time your hits right. And drink a healing potion once in a while. Repeat ad nauseam.
And when you level up, the ghosts level up too, so the game probably doesn't get any easier as you progress.
I think, all in all, it's more of a test of your patience than your combat skills.