Just to chime in, the current Run script is highly tuned to getting a user to Hello World using the existing Hello World sample. If you’re looking to run your project locally, I’d recommend checking out this guide - https://github.com/twitchdev/developer-rig/blob/master/docs/MacLocal.md - it breaks down the run steps that the script is using and you can apply it to your own code. You’ll want to focus on the yarn host command.
If you have suggestions for better general scripts, happy to hear your thoughts!