Really cool minimalistic pixel-art! I liked it!
The controls are a bit counter-intuitive in a way - do you need to rotate it? How to rotate it? When do you hurt enemies, and when do they hurt you - how to distinguish it? Does you "upside" attack but "downside" gets damaged? It would benefit from short smooth explanation. I kinda understood it after reading the description, but it was very non-obvious.
But over - nice art and great smooth movement!