OP's app looks more like Canva (https://www.canva.com, which Spark is also a copycat of), especially the icons in the left nav. The timeline view is super neat though.
To be fair, as someone who doesn't know what it is, I clicked "Watch Video" on Spark website and that video did not show me what it is and how to use the product but rather some nonsense-story. Story creator website showed me exactly how the app looks like and how to use it right away without having me to click anything. Awesome work, bookmarking it for future use!
https://spark.adobe.com/