I am amazed. The graphics are amazing and it did not expect such an entry in this jam. You should definietly add some screenshots to your submission, so that other people will notice this.
The artwork, world, music and enemies are great. I feel that the gameplay itself is therefore a bit underwhelming. Like the other commentators, I would like some feedback for the shooting and also some sound effects. Minor improvements, that will make the game overall great.
Keep up the good work! :)