This turned out as hard as that first little playtest I did! I made it to level 8, but after about 4-5 minutes I had to stop. That level was just frustrating as a player has no natural means of tracking both electrons at once, and with the levels so different, it was very easy to end up colliding with a wall or proton without seeing it and just getting naturally frustrated with that.
Its great you were able to explore so many little variants on the mechanics, however. I do wish there were more levels using things such as the arrows and the reversal gates. (I also wish there was some sort of representation that you are in a different state when controls are reversed as, at first, I wasn't sure that it had done anything).
Also, my eyes would rarely train over to where the ohm measurement was for a level, as I would want to look at the level and start immediately think about what I would need to do to go through it. Perhaps a more integrated way of adding the resistance into the level geometry?
Anyway, thanks for making this!