Besides the occasional bug where your player gets trapped, I think there is some potential, and shooting these blocks feels good! The water gets out of control waaay to fast, having it be a little slower to help the game keep going and be more exciting could help. Also, it's a bit to hard to understand where the water starts and where it ends. Anyway, nice job!
P.S the first time I used the gun my ear almost died, would help to have some music to help me understand what kind of volume to expect.