Well ...
Long story short, the lack of the inventory is kinda annoying since you have to click a lot. I would suggest to add a list of the items you got instead of the selection ... Then, I agree with 0114ch - you should probably give some hint when you hover the mouse over a clickable object.
On the bright side, even without hints this was solveable. Sometimes it is pretty easy and sometimes it makes you think. If you like games like this, I would recommend it.
Besides of that, I needed the walkthrough in the end for the machine code. And a small report: If you click the right spot, you can get the clawhammer before you used the hacksaw blade. Hope this helps.