I was only able to play alone and then the gameplay is a bit frustrating. But I think with two players it would be quite fun. It is really hard to figure out, what exactly you are supposed to do, even with the instructions. The controls were ok, but it was a bit annoying that you couldn't turn when you were at a wall and then had to move a bit away to face the building table. The game looks really nice.

Graphics are fine and the lights shutting down one by one is a neat thematic idea. Too bad the interface and interactions are not very intuitive.

To make a hypothetical single material product you need to:

* Take (Press 'E') base material from right side to middle
* Take base material form middle to the refiner
* Refine material (Press 'F'). You cannot leave the refiner!
* Take refined material back to middle
* Tale refined material from middle to the builder
* Start build process (Press 'E')
* Wait until the build process has completed. You can leave the builder, but if you wait too little or too long the build fails.
* Lastly take product through middle to the release basket (Press 'E')

There are two inconsistencies in the process which could be easily removed:

* Pressing 'F' for refining is unnecessary. 'E' would work just fine, reducing your button count to one (sans movement input obviously)
* Not being able to leave the refiner. Why not? You can leave the builder to do something else so that would make sense here too.

A little :bug: You can accidentally drop items (batteries and screws) over the counter if you drop one on top of the builder.

Ok co-op concept, ok execution, some design issues and lack of polish. Put a bit more time into this and it'll be fine I reckon.