This is VERY Promising! Extremely interesting take on the "player-moves-in-an-orbit" implementation of the theme.
I think the game has a lot of potential to be this fast-paced, ninja-gaiden inspired spin-around enemies for fast-paced action. The artstyle and the black-and-white pallete lends alot to the imagination and can make for a highly stylised game.
Controls are smooth and game is easy to get into. I think the camerawork could be revisited as it can be quite disorienting for the camera to move around that much, especially in trying to find the boss.
Boss fight is very easy though, if you position right, you just have to put your pivot into the eye and you instantly win.
Otherwise, very solid foundation for a good game