I like the core game play and idea. Creating a strategy game out of breeding animals is certainly novel and intriguing.
Parts of the screen are cut off due to the limited size of the window. I was unable to see ribbons I had purchased. You should change the game window on the itch page and tick the fullscreen. This can be done without altering your game.
I wasn't really sure how the scoring worked. It wasn't clear what the combos score. I seem to do ok just by placing the sheep randomly. The hazards strike randomly, it doesn't really feel fair. Perhaps positioning could be more strategic. It would have been nice to mix multiple traits. For example, size or shape. That would have added more choice.
I would add a restart game button instead of telling people to reload the entire page.
The art styles are very mixed. You have realistic looking backgrounds against hand painted art. It would've been better to forego the backgrounds and just paint a quick and simple blue sky.
This has clear potential, but there's a bit of work to be done.