What a lovely atmospheric game you got here! As many had stated. the aesthetic, ambience and music works really well together to give the game a calm and relaxing vibe.
I really love the attention to detail while exploring! Like how the birds will fly away if you get too close, the tall grass will shuffle when you move in it. However, I feel the game will be even more immersive if there're some interactable objects in the environment or maybe even the ability to leap and some interesting things happen? This way players will have some progress feedback or a sense of reward when discovering new things/exploring. Speaking of progression, just when I was about to feel alone and lonely, I got to the end and I found another cat! A lovely touch to the ending tying the whole game back to the theme! Another feedback is that the walking sound volume could be reduce as it kinda drown out the ambience a bit. Adding some variety could also help in reducing its' repetitiveness.
Overall I enjoy your game, get to vibe and explore as a cat in a beautifully crafted world. Well done, and keep it up!