So I did eventually figure out how the echo-ghost mechanic works. Unfortunately I can't get past the jump over the chasm after the first checkpoint. I figured out how to push the button with my ghost to create the platform, and I can jump onto the platform just fine, but no matter how I time the second jump (off the platform onto the ledge), I can't seem to make it. Maybe there's something obvious here that I'm not seeing!
I'll give some feedback on what I did play: I think there's a great idea here! Unfortunately, the way that the echo mechanic works right now (automatically deploying after a set interval) is just quite unintuitive, and really interrupts the gameplay. I found myself trying to explore the level and get used to jumping around, and then suddenly I'd be locked out and I can't do anything while I watch my recording move around. I think putting the echo mechanic in the hands of the player is a real must for this to work the way I reckon you're intending.
That being said, I really like the idea of having a little ghost echo that Ihave to record and go push buttons for me. I could see some really cool puzzle design coming out of that, so great job on that front!