A great little course that was very easy to follow and easy on the eyes.
I can envision how I would duplicate it, and as a suggestion, I would make each of the five stages clickable rectangles slightly different as a way of letting the learner know they've completed the stage, such as making a "Completed" state, where they can revisit. My personal fav is to have a green check mark appear, and I can see you've done something similar for each stage (ie change the icon to a check make when they click on it). This is just a subtle way of letting the learner know where they are in the project overall. Also, consider if you feel, as a learning designer, as you happy with the learner being able to click any of the stages in any order, or would it be more beneficial to do it in the order it appears (ie you can't access stage 2 until you complete stage 1).
Other than that, I thought that it was a well-designed project, regardless of it being your first attempt. You've even given me a few ideas, and I've been doing this for over ten years. Be proud of your efforts! π€ππ