If the connection is supposed to go from left of field to the the right hand side it seems to me about the only way this can work is having two straight pieces (light blue) and one that happens to close the link...
I also had the issue the controls not being shown correctly. the font glyphs should be packaged into the game.
On the plus side is the raster is shown in the background so no (mis-)guessing which column you're in with a piece still quite up the screen.