I loved the artstyle, the sock looks so naughty!
I don't necessarily think it is monotonous, neither boring, but it would benefit from more variation in boss attacks, or even increasing velocity and adding a dodge mechanic to the sock.
It would also be nice if the reload time was shorter. I wasn't sure what I was missing until the bar started refilling.. Adding a tutorial as well would be really helpful!
Anyways, for me this one stands out from the artstyle and music. Well done!