What an amazing achievement!
I loved this. Every little detail was thought through and the mechanics were pretty neat. I enjoyed the gameplay and can't wait for the full game.
With that said, I had to nitpick about the code system - I think the player should be provided with the explanation on how to put the numbers in a correct order, otherwise you might have multiple sets of combinations. But, that's just a minor thing. The overall quality for the game is superb.
Best of luck with the future developments.