Sorry if it seems messy, had no time for playtesting by other people.
Here's what you have to do:
1) Go upwards on the flying blocks
2) Activate first 2 buttons.
3) Drop on the block between grass and button, activate the third button (the gate will open)
4) Drop on the ground, jump over the bug, then onto the opened gate
5) A couple of tight jumps and you're there!