Great font! I really enjoy using it in VSCode. The only issue I have with the font at this time is that the ∀ and ∷ symbols don't seem to be included. I believe that's the case because, when using dark mode in VSCode, the following code:
runMem ∷ ∀ a s. Mem s a → s → Tuple a s
Looks like this with Fira Code enabled:

I've read that VSCode (among other applications) has issues correctly styling (including applying colors) symbols that aren't included in the active font. If I switch from Fira to Menlo, for instance, I see the following:

As you can see, in Menlo, the symbols are nicely styled with enough contrast to be easily visible.