Conceptually, I like this a lot! Some of this may sound harsh, but I honestly don't mean it to be: Genuinely, there's a nugget of a game here that I think you could easily hammer into the real thing and sell it on the market. The combination of adding stuff together and getting combos is very interesting and there's a grain of truth to it that could make this game really take off.
I think there's a few things to improve on for this attempt. For one, hand-written stuff can sometimes be charming, but it's much better to just go get a free font and use it, for readability purposes. I like dafont.com for those purposes, just make sure it's a 100% free font so there's no trouble with you using it. At the same time, this would actually have dramatically simplified your game because you wouldn't have had to worry about writing stuff out and turning it into images, which aren't very readable for accessibility sake anyway. But really it's the simplification where it's at, so you could add more cool stuff.
Secondly, instead of stuff just disappearing if you tried to put it into the staging area (or whatever it's called) when there's something already in it, I'd have liked it to just go back to the inventory, perhaps with some kind of indicator that it was not a valid move.
Finally, indicators for the various states of the screen would be really good to add, like "Forge is in-use," "there's a new customer," etc. I think while the timer adds a decent and fun amount of pressure, it might make sense to spread out the customers a little bit and give them some random timings, instead of just one after another, to simulate that there are not adventurers going around all the time, but also at peak time, they can crush you and make it hard to keep up. There's something there, an economy management type of game, and I think you've almost got it!
Very good submission for only your second (or third, never know how to interpret those) GWJ!