I didn't understand how to complete level 4 so I just played around with some things. I found that the box near the bug can be moved into the small gap near the end of the level and can then be climbed on to complete it. Image explanation below.

Don't think this was intentional but I found this solution easier than the intended one.

Ah! Amazing! :D this level has been broken every which way now 

I imagine in 3 years when we're randomly discussing the early stages of the game someone will bring the "second 4th level" up
everyone just goes silent, even though it's a text conversation you can feel the glares
the new guy finally asks
"what was the second 4th level"
and then "we don't talk about bruno" suddenly plays in the background but the lyrics are edited "we don't talk about second 4th level-no no"

Oh you found this too? lol, this was how i solved it first about a week ago