Agreed, I really wish I had more time to flesh out the tutorial, but I'm glad you enjoyed :D
The idea was that without a tutorial, you could explore on your own, but I understand how that can be difficult especially without a visual on the different values of each input and output. Temporarily, I can answer for now. All values are integers (no decimals or negative numbers) with 10 digits that'll loop over. Rotation is in degrees with 0 degrees being facing right. Turret rotation is local. Coordinates start from the top left which is (0, 0) using traditional coordinate systems often used in graphics and warfare, and for Player-enemy angle bigger than zero can be either to the left or right, bigger than 180 is to the right, and if you don't want to implement more complex logic you can do player locking rotation onto the enemy by hooking up Player-enemy angle to Left or Right rotation.
If the game gets enough positive ratings and ranks high enough on the game jam to where I feel there's enough interest I'll continue working on the idea including improving the tutorial.