first of all, I love the graphics.
As for the gameplay, and comparing it to Ninja Gaiden, I see a big problem with your sword attack: there's a delay for the hitbox to come out, and makes the gameplay frustrating. This delay caused me to keep getting hit since my sword hitbox would not come out in time even though I pressed the button before colliding with enemies. Your other abilities seem to have the same delay, which I think really hurts the gameplay.
This reminded me of how your attacks works in classic Castlevania, but in those games you can clearly see the character winding up before attacking and they have a slower pace. Idk if this was the intend for Eclipse Blade, but since it looks so similar to Ninja Gaiden, I believe most people will find this delay in your attacks very counterintuitive, get hit a lot and feel it's unfair.