This game reminded me a lot of Hyperlight Drifter, the art direction is spectacular with the use of pixel art, and that was the first thing that captured my attention when I booted up the game. I have a few points I'd like to make:
The game felt way too easy, and the first boss music was a bit too short. That's all I can think of really, you've got an amazing project and I hope that it becomes a full-length experience because I'm a sucker for this kind of atmosphere, Bravo!