Grow

Got this link from a friend. In his words:

"It's a strange little game. The idea is simply to work out which order to upgrade your little planet. Get it wrong and something bad will undoubtedly happen! Trial and error your way to victory!"

If trial and error isn't your style, here's the solution I used:

Tree   2 | Chest  7
Stairs 8 | Castle 3
House  1 | Water  4
Rocks  6 | Tower  5

That is:
House, Tree, Castle, Water, Tower, Rocks, Chest, Stairs