Very cool idea, although I wasn't sure if I was supposed to be able to click on the greyed-out items or not. I could use them in recipes, but they didn't show any description in the bottom left.
It was a little tough to figure out the logic behind some of the combinations. Sometimes it felt like I was just trying every combination (but I think that's something that's common to all crafting-style games). It was definitely satisfying to finally find that combination that's been eluding you for minutes.
Nice work!