I think the game is quite difficult due to the swam of crows. As there is a delay for each swing, it's difficult to swat all of them away without a little bit of spamming, which results in the crows sending in their Navy SEALs from the sky, which can't be swatted away (in time).
It is also difficult to tell where the crows can be swatted away within, and sometimes, the rats can overlap their "swat" hence, the crows stay but the rats remain.
Similarly with ChickChick, "ensure choosing (Point, No Filter) and compression (None) when importing pixel art over. Adjust the Pixels Per Unit to a size that your character should fit in (if the sprite is 64 pixels and you want it to take 1 Unity unit, set it to 64)."
Overall, I played this multiple times because the game was fun and challenging, but it's an unfair kind of challenging.