I am playing this right now! A very nice, addictive game. The programming language is a kind of subset of Python.
The in-game editor is still a bit clunky, but one can edit the source code in an external editor like VS Code. The game has an auto-reload option.
Caution! Just because one saves the code in the external editor doesn't mean the entire game state is saved! It cost me a few unlocked upgrades the first time I closed the game, not saving because I thought it automatically does so. One has to save the game state explicitly, before closing.
I already have the full game area and a max speed drone, but I'm only just about to implement planting cacti. So it'll be a while before I unlock multiple drones. But I have already implemented efficient algorithms for planting a giant Pumpkin, Sunflowers and Poly cultures.
What the game could have is that dictionaries retain their insertion order and a built-in array.sort. And it is sad that the nice music stops running as soon as one starts the game.