Milk

Al''iens love milk. That’s why they go around abducting cows!''

But, alas, Hyoogle is lactose intolerant and it gives him gas.

So pick up cartons of milk to help propel him through the air 

In game description 

Milk is probably one of the most important object in the game, it allows Hyoogle to fart which is one of the best ways to dodge and get too hard to reach platforms