I played the game for sometime... it is really a fund game and I enjoyed it but there were few things that made me feel confused while I was playing.
Some of these I can see were addressed in previous comments; not clear what I am supposed to do in a level as the board is empty with 1 emitter only. Not clear how points are calculated. Not clear if how I lose this game. Sometimes I ended up setting my own goals and my own setup to get more points (ignoring whatever on the board, or sometimes when the board with empty).
So far, I haven't really figured out what I need to do, what is my ultimate goal? Is it to get higher levels? If so, it isn't quite clear as not every board gives you a problem... I ended up (in level 1) with multiple empty boards and I didn't really know what to do with them. An example of this is Candy Crush for example, your objective is to get to the next level or higher score if you will. Angry birds, destroying all the pigs. Cut the Rope, feed the little monster.
Always something clear, but sometimes that wasn't clear in the game. Specially when some "Receivers" spawned facing the wall and I was out of powerups to turn them so I had to wait for one to appear.
The tutorial didn't prepare me well for the above problems, though I got the jest of what each element does.
I liked the music in the game, but I feel that prolonged listening to the track would definitely make it boring (I played for about 30 minutes or so). So I'd say have some more tracks embedded.
All in all, I enjoyed the game but the few things that I mentioned (and the previous post mentioned) made me feel lost and not sure of what I do.
Very well done game though and a really cool idea
Good luck!