Well, it's definitely a tech demo, but a fun one at that! It reminds me of those old PS1 discs that had game jam demos on them (I can't recall the name, but you get the idea). This demo shows a good basis for a game, and I enjoyed playing around with the camera. The movement of the little bean character is also quite enjoyable. (moving on the ground ^^)
I can see that you've put a lot of care into this tech demo. It's surprisingly polished, considering its nature. I can only imagine what you had planned for the game jam, but it's clear that time constraints got the best of you (don't worry, it happens to the best of us!)
I must say that I love the system you've implemented. However, I can't rate it too high because, as a game jam entry, it falls short in terms of incorporating the theme of echoes. If I were solely basing my rating on tech demos, it would be quite high. But since it's a game jam entry, I have to be critical.
Nonetheless, I hope that what you have here can serve as a solid foundation for a great game in the future. With some further development, this could turn into something really special! Best of luck and wishes in the future!