I liked the decisions you have to make when deciding how to make the game harder for yourself, I had to really think about whether double jumping or wall clinging would need to be removed first (I went with removing double jumping because the wall cling was quite essential for me). Really enjoyed that!
I think the game could be even better if you revisit the platformer controls, as there is a bit of acceleration and "lag" where I stop pressing a movement key and it keeps going for another second, which made the precision platforming nature of this game a tad frustrating at times. That and the jump felt a bit floaty and imprecise - having a system where you can control the jump curve a bit more would go a long way (if you've not seen the GMTK Platformer Toolkit that Mark made, that might be a good place to start).
Nice game and use of the concept!