Some of the best animations are usually the ones with the simplest concepts and drawn in a simple manner, though they don't always have to use dialogue. However, these animations are succesful because the concept and style are done well: this is a perfect example of such a thing. Well done, my friend.
So cool! Do some more.
This is something we call IMAGINATION
Add A Part Where They Goes In Waterfalls Then They Goes Back Then They Keep Going In The Waterfalls Make It 1 Hours Then When They Stop The Waterfalls Goes Back.. :P