This game has a lot of cool aspects. I'll send you some feedback in both directions :)
Good:
- The mechanic felt fresh and interesting
- The graphics have a really nice feel to them (Though I'll say that water tile looks suspiciously familiar...)
- Sound and music suit the game quite well
Not-so-good:
- Default resolution didn't allow all of the signal command cards to fit. Took me a minute, but realized that I could resize the window to display them all
- The controls are not ideal as you have to switch back and forth between enter and the mouse. A nice touch here would be to maybe allow WASD to pan the camera, or to let click on the mouse finish commands instead of using the mouse buttons to be the signal choosers.
- Sound balance was a little harsh at times (such as the sheep when the whistle is blown)
Take the critique in a good way, because I really enjoyed this game. I wasn't able to beat it in the later stages because I couldn't plan far enough ahead of the camera to let me get the more complex track pieces built fast enough. A great entry and a great interpretation of the theme. Well done and happy I played it.