Knocking over the tree is one of (several) ways I came up with to get past that area.
If you need some tips
- You have a lot of bricks at your disposal at that point, and can build wherever the tree is not, or on top of it
- If bricks are connected together enough they actually freeze in place, so you can make anchors.
- When you pick up a brick there is a little version of it above your head. It still has collision. Although it's a mostly cut mechanic (and not required) you can still use that tiny brick with your jumping power to really push physics objects.