It's a cool idea but I can't get past the big gap at the beginning. I think I understand that I'm supposed to jump off the edge and make a clone, then jump on the clone to get across, but the controls are just too janky for me to make that happen.
Also, it took me a while to understand that making a "rewind" clone that copies what you did, and a "stationary" clone that floats in mid air are two separate mechanics. Maybe merge them into the same thing?
Some other ideas:
-There needs to be some kind of visual feedback for when you're "recording"
-Make clones look different from the character you control? Maybe have them a different color or semi-transparent?
-Don't use middle-mouse as a button in a web game. In my browser, that starts scrolling the page, and also seems to trigger a glitch where the character gets stuck walking in a certain direction