Ah man, that must be bugged. If you don't press 1 for the first 10 seconds on level 2 it should pop up and say 'Press 1' to make sure people don't miss it!
Thanks for letting me know
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Yeah I timed it so it would pop up just before you had to move the electric diverter. The idea behind it was to give people a chance to work it out for themselves but inform those people that didn't work it out.
I'll be sure to make it more prominent for my future development of the game as it's a crucial thing for people to miss for sure!