You weren't kidding, it's pretty hard. I only managed to finish the longer route after trying dozens of times. I like how you made the beginning section have the narrowest tunnels, if later sections had them I probably would have given up because it would've been too hard, so good choice. The tension is still there even when the tunnels are wider since the player doesn't wanna lose all the progress they've achieved so far. Simple but in a good way, great job! :)