Crit

They were in the shoe department of the store. The floor was a polished black with the scratches on the reflective surface. Everything was very blue. The store was crowded and a little loud but not very.

Your prose is boring.

The shoe department was bustling with a large crowd of coupon snippers, scratching the polished black floors with the heels of their shoes. Beyond the black of the floor, everything was blue. Some may have called the walls aquamarine, others would have called the ceiling navy. Yet to Nick everything was blue.

This is far more fun, and since you're eventually going to reveal that Nick is kind of a downer guy, everything was blue will ease the reader into it.

How is Nick looking up? Is he tired, bored, annoyed? When he's feeling the plasticy leather, what are his thoughts?

Amy smiled towards Nick.

This is a little more active.

She held the several hangers worth of clothing, but you can probably expand this with more vivid imagery.

He owned just the pair. Not quite, he had several pairs, but these were the only ones he owned.

Use the word "owned" as something he feels like he is possessing, that he truly owns. He has other shoes, but he owns this pair.

They were dark blue and brown, chewy and drooping. The rubber was almost not
rubber, and the shoes were almost not shoes.

I would like to know which parts are brown and blue, just so I can imagine it in my mind otherwise it isn't concrete.

She kissed him where? It will characterise her.

She was looking away.

Too passive. She looked away, or she brought her attention to a pair of heels.

She waved him away and then left. He watched as she left him alone in the crowd. He felt the shoe a little longer and then placed it back onto the shelf. He made his way out to the front of the store. The sun was high and painted everything with a yellow hue, but the walls remained blue. He returned with the cart quickly.

Don't say he got this and he got that. Make it a little more dynamic, or make it boring but with enjoyable prose. I want to know if he's doing it quickly, anxiously, etc.

He stopped and the produce department was rickety-free.

This is nice, more of this.

He looked at the grapes as if he were examining a (something, just add some characterization.)

He ignored the next section entirely, staring at the racks with the sunglasses to avoid looking at the other items before finding solace in the electrics department.

Gray metal with the plastic peeking out the seams. He pulled one out, looked at it and put it back. They were a lot of money and he did not have much this morning.

Is it heavy to him? Hefty? How thick is it? Describe it, I actually have no idea what it is.

He pulled one out, gave it a cursory examination, and then placed it back. Too heavy for his feather light wallet.

If you describe how heavy it was for him, it emphasises the last sentence I wrote.

Amy appeared from nowhere, as she always did. Nick raised his brows and placed a hand on his chest in surprise, as he always did. Then he drooped, sighing out from the lethargy of being in public. Amy held a small beat plushie in her arms, taking the place of the hangers of clothing. It had blue fur, some would call sapphire, and black eyes, some would call onyx, and it's eyes held a white glint.

"How's it going?" Nick asked. (So we know who is talking.)

Rest of the exchange is fine.

They were at the cart.

Do they teleport? You don't have to describe that they are at the cart, but you should describe that he grabbed it.

He fought to turn it as Amy's attention was brought elsewhere. (Repeating the same phrase so that reader connects this as one of her traits.)

"Look at that!" The excitement in her voice was evident. She pointed towards the clocks. Rows and rows of clocks. She pointed to a clock the shape of a cat's head, with large leafy ears and black fur.

Jumping up and down or bouncing?

He was too tired to fight. They were already in the check out lane. It was cold. Amy kept talking and Nick kept nodding. The store was bright, and the blue was turning yellow/remained untouched by the yellow. (Either it was turning yellow as in he's feeling happier, or it remains blue because he's feeling down.)

This covers most of my criticism of your writing. You have some decent prose in there, but I want to see more of it. Sprinkle it in a little more.