Thanks for playing! Yeah the connecting part was not very clear visually, you had to left click on a machine and hold then drag in the direction you wanted to connect machines. So the placement of the machines didnt matter too much, but you had to connect the machines so that the bullets would go in and out of the machines based on how you connect them. Definitely need to work on the useablity for connecting machines, its too hard to tell whats connected to what.
Reviewed your game also.