I love the 4-way attack. I implemented that, too :D
I like the visuals very much, but at times it is hard to see which block is in the foreground and which in the background.
The move where you shoot the blue yarn and then cling to a wall is awesome.
The fights were a little too unforgiving for me, though. But I am also not good at Hollow Knight. So take that with a grain of salt.
Also, a map would be nice.
Overall very good job. And you made it in only 13 days. That's impressive.
P.S.: the music rocks