I love this concept! The presentation and framing are fun, and the game feels appropriately scoped for the jam.
It feels a little too easy to cheat - I found myself wishing that the game ran your "script" across multiple input data to confirm that it's doing what it needs to do. As it is, running head 4 on the temperature data gives the same result as tail 4, even though only one of those fulfills the objective of removing the headers.
Godot's GraphEdit node has some problems at different zoom levels. I understand that working around this wasn't within the scope of your work during the jam, but it would have been nice to have documented somewhere.
If you continue to work on the game, I'd love to play more!