We need a proper NES version, no discussion.
I will fail you on game design btw, by the levels are Montessori-like (which is good), but the excellence is not going on mechanically - in 3rd level, the second block is not pushing the player but just a button-smashing obstacle, that's a miss. And you know about the last screen. The balance issue is nit per see level or game design one, nor the gameplay literacy one. I'm sure you'll find the solution!
I'm leaning on you coz the game is good and could be much better yet, for real