I just wanted to say that this game is absolutely amazing thanks for this experience keep up the good work. But as for some constructive criticism;the UI could use a couple small inprovments such as selecting the direction for conveyor belts. This is a bit of a very small chore, but I feel like you could maybe add an option for a different scheme where you have all four direction at the ready at the bottom of the screen so you can just tap the 'left' arrow and it will face left. Little things like that go a long way and would be greatly appreciated.
I don't particularly care if this gets added because this game is already amazing, it kills so much time and is so fun. Thanks man, hope you find this helpful or interesting!