I loved this game so so much! Pretty much everything here worked for me. The visuals are very pretty and clear; the music is great and I love how it matches the execution phase; the instructions are clear and precise; and the gameplay itself really engrossed me. It was super fun planning my moves ahead - playing it back in my mind and slowly getting better at intuiting my next steps.
The core gameplay experience is pretty tight as is - and doesn't need so much changing. I would suggest perhaps showing the previous failed attempt solution after each death so that it's easier to iterate solutions (rather than having to re-remember what part worked). Perhaps even an indicator for what step you failed on. Maybe there could also be feedback on your solutions telling you if you got the optimal solution (to encourage replaying to find the best possible solution).
Other than those, I think you can just get away with adding more levels and platform types and continue to flesh out the core concept you've outlined above. You'd still be left with a stellar game!