ok might as well do some hints for the other levels (except the last), just so you don't get stuck on a level. please don't rely on this list too much.
1 - Agro the enemy to pass
2 - the comment above
3 - after destroying the wall, you need someone to replace it.
4 - you need to posess an insect somehow, taking damage is necessary
5 - the platforms can fly, how can you?
6 - you need someone to break the box for you.
7 - boat powered by fear