It's a 'bit' gangly, but certainly more bit-like than the breadboard. Very nice design, especially considering how many components you have and the small size of the perf bit.
The use of your op-amps as comparators is very cool. That should make it capable of handling a wide range of input levels . If you put a dimmer on the input signal, then you should be able to turn it down so that it does not detect tilt with a low voltage in, right?
On the state of the input, perhaps an LED on the input would help determine if the input is floating. When it's triggering, the LED should light. and go off when the switch is open. If it flickers, then the line is floating.
All in all, it's a very neat device!