Nice! I will try and tone down the graphics. And it could be an exception error somewhere. Had one happening with mine and it was due to saving.
That makes sense with the proximity vs velocity. Maybe going a keyboard key for pickups might be more intuitive? Like x for strip and z for plug or something? Either way good work! :D
Overall not much more to add besides more features IMO. Maybe integrating light switches somehow? Still, a great little puzzle game!