Amnesia: The Second Dimension [FULL RELEASE 11/06/15]

[Darkfire]

Sup!
I love the mod, awesome level design and mapping.
Although I'm in the 4th (I think) map only, I can see that this game has tough time requirements.
I'll write a full review when I finish the game, but...
I'm stuck at the place where you have to destroy barrels that fall from top.

Spoiler below!

You have to stop the dispenser, then destroy barrels and open the hatch with another lever to the left. At least that's what I think. Problem is, that I can't destroy all the barrels- no matter how hard I try, there's one or two left when the timer is over. Am I doing something wrong ?