If anyone is stuck, I've written a solver that can be found here: https://gist.github.com/ygra/4d054235179ead26bea49ac65f1b8675. Takes between seconds and about 10 minutes on my machine, depending on the size of the puzzle (and 2–4 is on the harder end).
This is indeed the same as http://www.nikoli.co.jp/en/puzzles/hashiwokakero/ which was also the basis for Simon Tatham's Bridges from his Puzzle collection. What nags me a bit is that cycles are allowed here.
For anyone with some (school-level) knowledge of graph-theory this is trivial. So I guess this isn't even a very promising concept, apart from the very short play time.
Somehow weird when a "zen" game brings you to gnaw on the keyboard because there are two loose ends on the opposite edges of the playing field and you can't get them together :)
But it's a nice puzzle game, though 50 levels may be a bit too long. What might be missing is a function to lock tiles you know to be in the correct rotation (such as tiles with one exit next to ones with four).
somehow there seems to be absolutely no correlation to the turning of the wheels and my keypresses. heck, even if pressing no key at all the whells turn all the way right or left immediately at the start. Hard to control? Maybe. Rather impossible, I'd say.
The bug with the arrow launcher all the way up or down actually depends on your keyboard. Most keyboards are pretty bad when it comes to multiple keypresses at once (sometimes two keys at a time produce problems already, not counting shift states).
I had the same problem with the integrates keyboard on my notebook as well, however Das Keyboard in its current incarnation works very well here.
A way to save or something else so you don't have to start all over again might be nice. Currently the game is too unforgiving and frustrating, although it is a very nice idea.
Level 12 is definitely too hard after all those easy levels before. Or maybe that's the game's way to turn relaxation into frustration when you miss the 55 out of 60 a few dozen times.
Just played through the bonus levels ... and I found it much harder to get the right time and place to start a line than to deal with the colors of the triangles. There is luck involved but it's doable. The first two bonus levels were actually pretty easy.
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It's just above the two turrets, it's twice the size of the normal lift.