Thank you for your feedback, we’re happy to hear you like the plugin!
Regarding the rule you are trying to use, it won’t work in the current version due to the way WPCode checks the URL based on the WordPress request object to avoid conflicting values. This is aimed at targeting specific page slugs/page URLs and not query params like Oxygen is using. There are many situations where you want to target a page but ignore the query params, for example, Facebook adds a fbclid parameter to all the URLs it links to for tracking purposes, if the rule would consider those, a strict comparison like “Url [is] example.com/page”, would cause a lot of confusion.
I made a note to look into the options we have to allow more flexibility in the URL rules.