Nice stuff, really liked the zoom idea, somewhat reminded me of Gorogoa, cute drawings too.
I think the zoom direction was a little fidgety, it might have been better to do click-to-zoom (+click-to-zoom-out) instead of pitch / mousewheel, so it would be more obvious when a "zoom choice" was happening.
I did brute-force the last number of the code, but I guess that's on me for ruining my own fun. As they say: "Given the opportunity, players will optimize the fun out of a game."