A Boy and His Blob Forum

Sorry to waste thread space with this, but the almighty interwebs have failed to provide me with any kind of guide/walkthrough for this game, shockingly. 
 
  
I have a bit of a completionist vibe going on with this game, and have now encountered the first level with a treasure chest I just can't seem to find. On the second map, the third or fourth level I think - the last level before you get the bubble for the first time - the first of three chests. Did anybody find it and could give me a hint where to find it?  (not that I really expect a reply, but its worth a shot)
 

Awesome, thank you!

The other two were at the end of this level.  One was up high and the other underground.  The butterflies, fireflies, etc usually lead the way to treasure chests.