This is good. It's actually pretty addictive, and by using the same technique as mentioned below, the game was pretty simple. I like the minimalist graphics. Kind of felt like I was trying to unlock code boxes.
But.... er... how long does the game go on? I played all the way up the the 40-click squares, and it never got any more difficult. Just... tedious. Click click click click click click click. And if you accidentally pass a number you need, at that point it's 39 more clicks to get back to it... Not only that, but the game doesn't save, so when I reloaded the window... reset. All those clicks lost.
Honestly, I like the concept and I enjoyed playing. But without any variation and a mounting marathon of clicks, is the game suitable for more than 30 levels?