I like the simple escape theme, and it felt immediately apparent near immediately to avoid the cows' effective area.
The music sounded a little odd, as though there were two different music tracks overlayed over each other.
I like the maze layouts, though there were times where I thought I could slip the between the gaps where a few corner sections of the fence would meet (there's an example of that in your third screenshot in the lower left corner of the screenshot). A minor improvement would be to seal off any gaps to prevent the player from remotely thinking that's a gap that could be used.
I like that being caught by the cows doesn't simply reset the level, but instead shows the chicken being thrown back and then giving the player control again immediately afterwards.
A quick farm escape game.