Super frustrating in the beginning. Took a very long to figure out that I could draw wires directly from the numbers, even though they don't have red bubbles on them. I would remove the count down timer as well and opt for a count up timer, with say a ranking system based on time spent, that way the slower among us still complete the game without being frustrated, but the quicker can still fight for the max rank and higher speeds.
Mouse overs didn't always seem to reflect what I was hovering which wasn't too much of an issue, but I imagine most users won't know what a modulo operator does. Or was it a bitwise AND?
Cool concept and nice sleek execution though. A bit of work on new user friendliness and you've got a pretty cool thing.