QWOP-tier controls. multiple left hand movements across the keyboard to do anything. Impossible to play without the guide up on screen and hunt and pecking at your keyboard.

not clear what tiles arms are reaching in and out of
"Just copy opus magnum for controls, at least for arms. Or heres an idea: you click three times when placing an arm, once for center, once for pickup, once for dropoff. Would show a preview of the arm when placing.

Assembler building should be fully replaced with menus. You would be shown a list of recipes with reactants and products.

I dont know why deleting is hold Z + mouse click. Why not just have Z delete blocks? This also goes for conveyor belt building. It seems like while holding, but not clicking yet, there would be an opportunity to show a preview of what you are about to build, but this does not exist.

movement speed is too fast to easily go to any specific coordinate