Interesting idea! It's nice to control the character. The music seemed to me not good.
What I noticed:
- it is written that double jump on the "A" button.
- I jump on the platform, although it is far away.
- if you lean against the wall, then you will slowly slide down it, and the double jump works, you get a separate jump from the wall, not needed (if only to the side).
Good luck with development =)