Artwork could have been better. Although I think that it done blend in together, meaning that there is at least a cohesive art style which greatly improves the feels of the game and the immersion a player is able to reach.
The sound and the music were both, equally, on point as they complimented the theme presented by the art style. The controls were intuitive and I had relative ease to find the objective of the game. With that said, I would like to see some more progression happening. Maybe different types of enemies start showing up and/or the player receives boosts. Over very well polished, I enjoyed a lot. You did great!