Tridents, score 21,947,177

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Based on @Bubbler's answer, but some tinkering about with a wall finding algorithm led me to tweak the layout slightly:

I actually wrote a script where I could parametrise the number of long horizontal lines, how many of them had teeth, how many of them had gappy teeth, and how many of the ends had prongs, and this was the best I could come up with (also my wall finder couldn't find a way of improving it). Try it online!

Tridents, score 21,947,177 21,951,598

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Based on @Bubbler's answer, but some tinkering about with a wall finding algorithm led me to tweak the layout slightly:

Edit: Slightly improved my score by changing the exit orientation, which allowed me to use the trident shape there too. For some reason (I'm not ruling out human error) not only did @isaacg's "tricky routing" not affect the score for this layout but also my "trident exit" doesn't seem to affect the score for his layout...

I actually wrote a script where I could parametrise the number of long horizontal lines, how many of them had teeth, how many of them had gappy teeth, and how many of the ends had prongs, and this was the best I could come up with (also my wall finder couldn't find a way of improving it). Try it online!

Tridents, score 21,947,177

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Based on @Bubbler's answer, but some tinkering about with a wall finding algorithm led me to tweak the layout slightly:

Note that due to a display issue the start and exit display horizontally but they are actually both vertical. I actually wrote a script where I could parametrise the number of long horizontal lines, how many of them had teeth, how many of them had gappy teeth, and how many of the ends had prongs, and this was the best I could come up with (also my wall finder couldn't find a way of improving it). Try it online!

Tridents, score 21,947,177

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Based on @Bubbler's answer, but some tinkering about with a wall finding algorithm led me to tweak the layout slightly:

I actually wrote a script where I could parametrise the number of long horizontal lines, how many of them had teeth, how many of them had gappy teeth, and how many of the ends had prongs, and this was the best I could come up with (also my wall finder couldn't find a way of improving it). Try it online!