It's a fun infinite shooter game :D I love how you mixed the prompts and gave it some sort of a story for our little goldfish :)
I'm not a fan of the swimming mechanics though, it doesn't feel like you're in control of where exactly the fish will be when you press space. I also didn't know that you could move at all! (I read it in the tutorial after my first try) Maybe moving with the right mouse button might've been better since your hand is already on your mouse.
Also, the game just keeps spawning enemies after finishing which could lead to a crash if the player leaves the screen on for a long time :))) Here's my high score, I didn't beat your score of 170,000 though:
