Thank you for your feedback! I really appreciate it. I would invite you to look at the post-jam version which has some of these things addressed.
1.- I agree that the nature of the only one button + morsecode is slow. It is inherent to the limitation due to the Jam theme. I believe the new undo command helps reduce the punishment for doing 1 wrong move.
2.- There are 6 new levels before level 1 that introduce the mechanics and are very simple/small
3.- I agree. I had more complex ideas in mind but went for very basic puzzles since most people would be stumbling to learn the input mechanics.
Thank you again for your detailed feedback.