yes, you can use any lua editor by opening the .p8 text files. There should be some data encoded in there as well, but if you don't touch that it's fine, and PICO-8 reloads automatically on run.
At least, this is my understanding of it. I still use the built-in editor...
If you press ctrl+r instead of writing "run", it will reload the cart automatically for you if you haven't edited it in pico-8 (just entering the code editor breaks it even if you don't change anything)
If you do, you have two choices, either reload the cart, or save in the code editor (remember to then save your real changes in your external editor again!)
Then the ctrl+r trick works again.
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