Neat concept for a game, really enjoyed piecing together the solutions, especially in the later stages!
A couple of thoughts that might help improve the experience - For one, the way processors were built felt a little clunky (and random at times - [M] for B + C -> G? ). What would probably be more intuitive would be something like a drag and drop list of all possible processors at the bottom (since most of that is unused space anyway).
Also, since the game seems to be about designing optimal circuits, it might make more sense to start the timer once the sources are activated for the first time, rather than at the start of the stage. At least for me, I basically just found myself mentally designing a solution, then clicking "restart" before I actually built anything. This would just remove that layer of clunk, as well as forcing players to find relatively optimal solutions for the stages
Again tho, I really enjoyed this jam entry overall - solid concept for sure! :)