I like the levels, they make good use of the mechanics you've created. I also like how I can also choose what to do with the current loop. It gives much more flexibility and makes mistakes less irritating.
There are 2 things with the controls that bugs me. First thing is that jumping on top of a jumping clone feels a little weird and inconsistent. Maybe you can sort of 'add' the y velocity of the clone you are on top of when jumping from it so that the actual player rises faster than the clone? The second thing is that movement is a bit slippery. This is mostly just my opinion, but I prefer the controls to be more snappy, especially with insta-death spikes involved.
Overall, I still think this is a great game with great level design and fitting art and music. It's pretty funny to get shot and killed by my past self.