Hi Viko, sorry about all the crashing! I don't have a mac myself so I'm unable to do any proper testing of that version. I might not be able to do anything about these issues, but just in case - could you get the game to crash again, then email your crash log (found at ~/Library/Logs/Unity/Player.log) to support @ graemeborland.com?
Done. I'll try the Windows version under wine or a manually-run mono, maybe.
EDIT: Windows version works under wine so long as you don't play full-screen, except that neither of the lines I was clicking on before work. I can get to where the one further back lead from within the game itself, so I assume that's also a bug, but I'm not sure what the lower-down one is for.
EDIT: On replaying, it turns out that the third puzzle _does_ have a proper visualization like the other two. I thought it was meant to be played from the screen of the puzzle on the right, which made it much more difficult because I couldn't see the lines or the end points. After completing it the "proper" way, the screen goes black, but I was able to see the rest by playing it from the screen on the right.