Great little game!
I found my first time I got kinda soft locked as I had all my space full with nothing I could merge, so second play through I made sure I always had a couple of things I could merge to create space and got me through the game, very neat concept :)
I'm not sure if I was bugged or not but I thought I created the final forms of each piece as seen in screen shot, but I was getting no more dialogue and couldnt merge them or anything :S also the copper wires stacked I could not merge or even pickup the top one, it just wouldnt let me interact with them at all once stacked :(