Also, I wish the unary negation operator was more visually salient. `foo * -bar` is very different from `foo * bar`, but it's only a handful of pixels on the screen. I've thought about trying to render it as an em-dash or something. Didn't NASA lose a rocket over a spurious - sign?
That said, have you considered making this outright illegal without explicit parentheses? I actually wish that more languages would require that any sequence of operators has the same precedence throughout; i.e. a+b*c would also be illegal. It's always a pain to remember the exact precedence rules, especially since they're not consistent across PLs, so I'd prefer any expression that is ambiguous to be explicitly disambiguated.
Kebab-case and snake_case may seem to read better when looked at code like it would be written text, but they read worse than camelCase when looked at it in a symbolic way.
It can be very hard to spot sometimes, especially after an opening bracket - if(!something())
Of course its generally better to try and rename functions or refactor to avoid the negative if possible.