This is such a cool concept! I love how the level design introduces mechanics and interactions gradually, and then becomes more and more challenging, especially from Level 7 onwards where creative use of using the Echoes and recalling Echoes is required.
The input-recording system does lead to some tracking issues where if you perform too precise an action (eg. jumping very near a gap) or if a recorded Echo is shifted slightly off its position, the recorded Echo will not replay its actions exactly.
Well done, especially for your first game jam!