Hi, the reviewer has given you pretty substantial explanation about why the item got rejected.
I guess what they meant by overall aesthetics is that the design looks basic, the color scheme consists of one color basically (with shades).
Some components are hard to read because of that - you have white text on light background in places.
The shadow effect on some components definitely needs to be changed.
What they meant by spacing/layout construction is that you don’t have proper spacing between some components, between the headings and paragraph text, etc.
As to style consistency - you don’t have a defined main color, accent color, text color, so that it’s clearly conveyed to the user - this is more important that this, or focus on this, then read this. Some of your buttons are one color, others are another color, and it’s not clear why. The same goes for the cards - in some places you are using blue shadows, in other places - light gray. There is no consistency.