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There is something claustrophobic about the camera angle, like you are crawling inside a low height tunnel. It kind of reminds me of the original Doom game and similar titles. Older mobile titles were also like that.

If you don't want camera to follow the kitten like it would be in a speed runner (so the kitten can still go far away like that), you can make the movement like original resident evil games and other horror survival titles of that era ("tank controls"). There are a lot of fans of retro style games that imitate PS2 titles in terms of graphics and this type of movement.

I also like the color theme, it could be something trippy or sci-fi, think movie Sunshine in a certain scene (it's a spoiler, I suggest you to watch movie first, it is very good).

Sound design can be crucial here: sound like 4 level Mario Bros (boss fight, underground level) could make this a scary game. Something silly could make it a cute wholesome game. Or you can do both, as Mario did (swimming level vs boss fight level). 

Speaking of Mario, check out fan-made Mario 3D version. If you recall original game, you can jump on different levels etc, in very drastic height differences (cloud level and swimming levels are opposite height of ground level). This is something your game currently doesn't have. 

also, imagining your game from different points of view can give you some new ideas. Tom & Jerry did it good, we never see the housekeeper because we view the story from animal's point of view. If the point of view changes to housekeeper, we'd see it as "top down" game (Baldur's Gate 3 for example).

And speaking of game itself, why exactly the balls fall in cat's direction? Is someone attacking him or are things falling down while he is hanging on a curtain or a tablecloth? Or is it him actually moving and balls are still?

Playing for an animal or something non-standard compared to human (both in height and way of walking) is interesting by itself: a lot can be done here, because you're experiencing world from different height, at least. There are funny titles like Wanted Racoon or Goat Simulator. Everybody loves cats, so your very simple idea can turn into something larger than you thought. And naughty cat dropping things is fun concept by itself, can be totally the main mechanics or an open world title or something, Wanted Racoon game is kind of similar idea: it is an open world with a racoon being naughty, check it out.

Also, cats vision is different from humans. If you imitate the colors and shapes the way they see it, could be more unique.

As you can tell, I have a ton of ideas and brainstorming comes relatively easy to me. Making those ideas into something playable is a whole different matter, it may not necessarily translate well when programmed into a prototype.

P.S. making your cat turn from time to time to smile and wink or something (for example when you dropped 5 items in a row) could be cute. Or tail wiggle etc. Tail also can be the way cat hits things. Cats are little gymnasts, there's some much you can add there.