It's really cool, that I have to exploit these intentional bugs to get around the obstacles.
I was super confused for a few minutes, I didn't know that the grappling hook only worked on the yellow box. Some sort of an in-game tutorial is definitely needed, in my opinion.
When it comes to controls, the wall jumping was also a little weird. Quite often it didn't register, I had to press the buttons very precisely to make the game register, that I want to do a wall jump.
Also I'm not sure how the game fits the "less is more" theme.
Once I figured things out and got somewhat used to the controls, the game was quite fun. :)