Hey! nice game. I do think the gameplay is too simple currently, like other's said it just becomes muscle memory and you lose due to your constant speed can't outrun the input conveyor belt.
Some thoughts:
I do think that some challenges like these below could add some variation in the gameplay
-Changing the flags of output conveyor belts
-Maybe getting items from input A & B to combine into something then to an output belt, etc
Nice job!