This is a pretty cool idea, I like how you can't see the orders and look in the part drawers at the same time. It's a little touch that forces the player to actually remember the orders rather than just go down a checklist and pull out each part.
It is definitely really hard lol. There seems to be a lot of variance in the number of parts each order can get, and the orders come in very quickly. It's really overwhelming when you are still trying to figure out which part is what (Labelling the drawers with what type of parts they have would help too I think). Maybe having the maximum number of parts scale over time, so that the first few orders only have like 2-3 parts rather than 10 would help ease the player into understanding the game.
The game also crashed for me a few times. Good job overall though!