It's a great first game you made there! I really liked the art and music and overall atmosphere of the game. The controls also feel nice and smooth. You could maybe add the ability to shoot different enemies and make levels or an endless runner with a highscore system.
Thank you for taking the time to write such a long review. Your feedback is greatly appreciated!
I added the description and pictures already. I will definitely continue working on the game and finishing it up aswell as implementing a few more things and fixing the score bug.