Thank you for your comment, I'm the dev (Yuri Lucarelli)
We know that the 'in game tutorial' is not appropriate because it doesn't cover every game mechanic, but there wasn't much time to do that. I try to explain better how does it work. You have 2 kind of robots, the first one (constructor) build things such as drill. The second one (deconstructor) dismantle things. But in order to craft a deconstructor you have to refine some Purified aluminum. To refine materials use the second tab of the crafting menu, select which material you want and click on a tiles near the central machine.
You will start to refine material in the exact position you click on, so if there is a different material in this tile, it won't start the refinery process. Remember you can use only the materials that are close (2 tiles distance) to the main machine.
Once you have the material you can craft a deconstructor by clicking on a construction you want to dismante. If you misclick you will create a deconstructor as well but without a task. You can click on a construction and use "dump this construction" in the bottom right corner, by flicking the switch.
After you craft some P. aluminium and P. steel you can start the refinery process of uranium that you need to craft keys. The keys allow you to open doors and get acess to other rooms, where you can find new materials.
Since constructors robots cannot walk on conveyor belts and drills, you will have to manage the 2-tiles corridor between rooms carefully or you won't be able to reach some location with constructors robots.
Last topic, the game doesn't have a proper ending, but you can try to craft the last key the "purest gem". It's a very complex task since you have to manage the corridor but also the space to stack materials (that is limited)