It's a pretty cool idea, but I'm having some issues with execution:
- The arrow on the red thing made it look like I needed to jump on top of it, or touch it, or otherwise get near it.
- Once I figured out that "E" was "grab", it kept falling down the pit before I could get close.
- Once I was past that, I grabbed the blue to make the box stop moving; put it back, so it would rise; and grabbed the blue, so it would stop. Then I fell off the box (because I thought there was a floor there) and when I tried to use E to put the blue back into the box, it instead went into the trash-pot.