Pretty fun game, it's cool that you were able to fit in RPG elements like leveling up and equipment! The controls felt pretty good, and the art and music looked and sounded nice. I saw in the description that there was a shop, but I couldn't find it or figure out how to access it; but I feel like I didn't need it as the equipment I picked up as well as the level up powers were pretty strong. One suggestion is to make the game a bit harder, maybe by lowering the amount of health you regenerate. It felt a bit too easy to shoot a bunch of fish, then when you're getting surrounded, just run away and your health regenerates almost instantly.
Overall, great job on this, it plays really nicely and was quite fun!