I think you should definitely keep working on this, it has potential and also shows how Stencyl is powerful and flexible.
I loved World of Goo back in the days, and I think that this type of mechanics could be expanded in lots of way... so don't leave this prototype alone, please. :)
Just a quick note: make the goal more clear, it took me a while to see it... but maybe it's just me. XD
Good job, keep up the good work!