Ok, pretty good game. I didn't expect to spend almost an hour on this :)
Had a nice progression, nice pace, good upgrades. Basically- everything that game of this type needs.
Moreover. My kids really liked this game, and would like for it to be developed further. More stuff to make, endless mode, what have you!
The only real downside I had, is that the sand looks sorta like nachos, so my kids made a song about nachos, that they sang every time we tried to make glass. This was fun at first, but got annoying :)