Lovely music and visuals. There needed to be more information about what I was meant to do though, and whether my actions were helping. I didn't know how much health I had, or how much the enemies had, and I couldn't tell when damage was being dealt or taken. I knew when I'd lost though. That slow fade to black was devastating...
This is a great start. The next thing I would focus on would be getting movement working smoothly (no juddering near boundaries) and communicating to the player how combat and health works. This can be done through feedback in the sound and visuals in-game, but a text description on the game page or submission page would also have helped (one to remember for future jams).