A lot of games utilized the swinging a weapon mechanic but this game takes the cake :D The feel of killing enemies when swinging is amazing. Also the double jump shuriken is a nice addition when your weapon is away you get have another means of attack.
One thing that bugs me is the retreat speed. I think there is no limit how yor spike can go so its sometimes takes ages when retreating it :/
Overall with some balancing and more content i would like to play again after the jam great work :D