This is very cool :D
I like the art and the animation (love the way it slightly moves doing the combos). Also the way it moves feels solid and predictible.
Enemies encounter didn't suprise much, maybe adding the backward dash as Castlevania does will give the interest that currently lacks.
I was about to stop playing when I found the first vertical platform challenge with the linear saws. The challenge was interesting but I felt extra punished by the way the saws slow you down (being hit at mid air and falling all the way down was a pain in the a**). Maybe just decreasing the player HP would feel more fair (but hey, just my opinion :) )
On the other hand I felt super smart when I realized that I could jump and attack to make a longer horizontal jump.
The overall was entertaining , good job on your first game!