I quite enjoyed this one! you've got a solid mechanic that was a lot of fun to play around with! Honestly I think you've already built a strong foundation and the main thing this needs is bunch of player feedback. I think elements like some indication when the clone switches, a way to gauge player jump height without trial and error, and the ability to autoskip to the next clone would be a huge boost for the user experience.
I really liked the levels with less clones, I think those show off the core mechanic much better and give the player some interesting decisions to make, good work with those! I'd love to see the mechanic explored further with different clone variants, or dynamic world elements to allow even more interesting player interaction.
On a visual and audio front I think you've done a great job! The art is cohesive and feels like it all follows a similar theme. I think there are several small things you could easily do that would clean it up and take it up a couple notches. For example, I think animated scene transitions should be your next go-to to immediately make this look much more polished. Same with looping persistent audio, having the song repeat every time a levels starts is classic and super easy to fix.
What you've got here is a wonderful jam entry with a bunch of easy potential for polish and exploration of the mechanic further. You should be very proud! thanks for making this :D