Welcome to the challenges! You are definitely in the right place to learn, I've learned almost everything I know about design and Storyline from these challenges and poking around the Articulate community.
As for your project, wow, you can clearly see your design background, it's beautiful and I really like how the videos compliment the vibe of the content.
My only suggestion is to remove or tweak the player, since your project is self-contained and doesn't really call for navigation buttons the player just detracts from the sleekness of the slides. If you want to add resources in you can always do that with a button or just customize the player so that it only displays what you need.
Really excellent work, I look forward to seeing more from you in the future!