Extremely simple game here. I'll start with what I liked, which was the cute variations on the fish; this kept me playing for a couple minutes instead of a couple seconds. Second, I did like the way the single cloud was rotated to create the illusion of multiple types of clouds.
The big issue is how even when I read the instructions on how to play by using the space bar, it was slightly difficult to figure out how to play at first. I'd chalk this up to two factors: The "play" button in the top-right (player's minds intuitively tell them that this should be clicked, but clicking it does nothing), and the delay between when the graphics are first loaded and when you can actually play the game. The second factor doesn't need to be addressed as much as the first, but you can simply update the itch.io page description to have better instructions, or add an in-game prompt letting them know they want to use the space bar.
Still, it does work, and for how simple it is, it was more fun than I expected on first inspection.