The art and sounds were cute and I kind of like the idea of serving items to cat customers. Also, that title is great, I saw it on the Discord and got curious. I think the game felt balanced enough in terms of being able to make it timewise through the day. I do feel like it can use another mechanic to make things more interesting than simply clicking the item image that's displayed in a text balloon. Like, the video store simulator Retro Rewind has the player finding movies for customers, but he's asked to pick a good selection based on criteria and customer wishes. Tiny Bookshop does something similar. Other shop simulators have you build out your store by buying new upgrades. Those are layers that add some strategy and give the player more choice, and having choice is fun.
I would put a tutorial into the gameplay, not as a list of text at the start. Take me through the steps as I'm playing it.
Clicking the cart every time felt a bit tedious and unnecessary. Why not just have it open the whole time?
Also, the font (at the beginning) is difficult to read. Although mainly that's because of those blocks around the letters. It looks more to me like something went wrong with the embedding, perhaps?