What else do you have in your email body? It looks like you haven't pulled in any variables - but that would also end up with you getting an email per individual overdue item, which likely isn't what you'd want.
I'd recommend building a table. For example:

⭐Step 1 - Get items with Review Dates less than today. You got this one.
⭐Step 2 - Create HTML table. Use custom, and select which items you'd like to see in the table from the Dynamic Content displayed from "Get Items". I've chosen Title & the Review Date itself.
⭐Step 3 - Set-up the email, and drop the "Create HTML table" output into it.
You end up with an email that looks like this:
