I love crafting games, it was nice to see one among all the platformers and puzzles ;)
The guessing game of the recipes was fun, but there's a couple usability things I'd try to improve:
1) I was a bit lost at the beginning because there was no indication I had to run around to look for materials... maybe if there was a rock within view of the starting screen it'd be easier to realize?
2) The dragging was a bit... painful. I so wished you'd implemented the "double click to move change inventory" feature...
Otherwise, nice game!