SPOILERS: Using this comment to document every loophole I found to win the game:
- Using compost bags to jump over the fence
- Throwing the axe in the grass (on the left) and jumping on its handle
- Using a compost bag to get high enough on the leftmost tree, and basically walking on the trees to reach the pie
- Doing the same thing with the axe, which might honestly be easier
- Throwing pebbles on the grass (left side) and jumping on them
- Using the axe to jump over the fence