I like the relaxed atmosphere! The poetic text works well with the photos, but sometimes blends in with the background color. Perhaps different fonts and text colors could be a fun way to add more whimsy and make some elements more distinct? Some music would really highlight the experience, but it will be very prominent in a project like this, so perhaps ambient sounds may be the better approach. Keeping the flower in one place would provide better access to it as a quick exit button and prevent accidental clicks.
The length of each mindscapes feels about right. If you're feeling passionate about expanding the project, more mindscapes rather than longer ones may be the way to go!