Really cool concept, especially the water gun! All of the animations are really nice and smooth. I liked how the music lessened/increased in intensity before and during fights. All of the UI elements were super impressive, and so was the entire itch page.
But it was really hard to tell what was killing me a lot of the time because the water would mask bullets, and the game seemed to break when I was trying to select an upgrade. Still a pretty incredible effort, and the fact that you made this solo is outrageous. Well done!