'The Butterfly Effect' Book by 

Cover: The cover is beautiful and eye-catching, but I can't see how it relates to the romance genre. 3 points.

Title: It is short and sweet, but its meaning is hard to see in the plot. Sweetie, if the meaning of the title is not at the beginning of the book, it will discourage readers from finishing the book. 5 points.

Summary/Blurb: It explains the plot perfectly without giving too much away. 10 points.

Plot: Honestly, your plot is very bland. I understand that Juliet and Miles had an issue in the past. He's trying to get her to forgive him while she wants nothing to do with him. Apart from the back and forth of their romance, nothing else is going on. Normally, a book has the main plot and also sub-plots. Sub-plots are there to give the main plot more dept, make more layers in the character's personality and make the story enjoyable for the readers. The pacing was okay. The info dumping made it very discouraging to read. It's better to show and tell in storytelling. 12 points.

Character development: You did a good job in introducing your characters, but we need more depth for them. It's understandable that the secondary characters are there to support the main character, but there needs to be more to them than how Juliet envisions them to be. Take her cousin, for example, Riya. It portrayed Riya as an anti-hero to Juliet, but she only comes in once. For the rest part, she's said to be the bad guy. There have to be more scenes of Riya being the bad guy for it to be believable. As the book progresses, I see no difference in the characters. Meanwhile, you told their personalities to your readers instead of showing them. 10 points.

Style of writing: Your writing is a combination of informal and first-person & semi-formal and third-person. You did a pleasant job in portraying the two styles, but the flow of the plot line started becoming rigid as the book progressed. I suggest sticking to one style to remedy this. 5 points.

Grammar: I spotted overuse of adverbs and adjectives, along with missing full stops. Please correct this or get yourself an editor. 5 points.

Total: 50 points

Now here's my advice.

About what I said about sub-plots. You stated that Juliet and Maddie met by playing online games. You can also say as a sub-plot that they are playing against each other or random players, say a competition for a prize.

Her dad is a good guy overall, but could you shed light on what happened to her mom? And if her absence affects Juliet. This will give readers an emotional outlook on Juliet. Or what if her dad remarries?

I also suggest showing instead of telling what is happening. Instead of describing your character's personality on the spot, show it through dialogue, their actions, the opinions of the other characters, and Juliet's monologue. The best bet is to breadcrumb it.

Finally, I suggest setting stakes. What will happen if Miles and Juliet don't work out their issues?

I hope this was useful and have a nice day.