This is feeling pretty good so far, but I found some minor issues. The acceleration/deceleration should be disabled if you want it to feel like Aria Of Sorrow / Dawn Of Sorrow / Portrait Of Ruin, which are all great games that seem to inspire this one. They have 0 acceleration/deceleration when walking, so you have total control over the movement of the character.
There's a similar issue with jumping. In those games listed above, jumps' vertical momentum stops immediately when the jump button is released, which allows for very precise attack points in mid-air. In Forsaken Castle, jumping floats beyond the target point.
Another issue is that the back of the whip doesn't deal damage. In Portrait Of Ruin, the back of the whip deals damage. This can be helpful for quickly attacking something approaching from up and behind.
Switching directions in the air doesn't work quite the same way, but this might be due to the horizontal acceleration/deceleration.
Played through it; very fun game! As a fan of Aria Of Sorrow, Dawn Of Sorrow, and Portrait Of Ruin, I'm excited to see where this game goes. I would buy it with the right feeling of character control.