The Engine Open Cloud API for Executing Luau will allow you to run a Luau script against a place in the Roblox game engine via Open Cloud. You specify a command, we spin up a server, load the place and run your code. You can then request the logs and return values.
We’ll have more details on this very soon as we are close to announcing our Beta.
Note: the term ‘universe scripts’ has been used in a few different ways over the years at Roblox. This isn’t something we’re actively working on right now, but we’d love to hear more about what you are looking for in a feature like this.