Really cool level - haven't solved it yet, I'm about 28 off right now. But I like the idea and will definitely return to it.
Edit: at long last, I’ve finally found the solution on this level. There’s a few nice techniques at play here, for a nice solve path. The last two took me a bit.
Really fun PP1 level. Initially I was 10+ off many ways until I find the key to success.
There are 2 small variations to the 177 though but this did not discount my preference to PP1 levels.