Thanks for the feedback! Yeah, sorry I meant to add a note in the description to note the differences with GDscript. I'll make sure to add that!
We would have added for as well if we had time. We thought the repeat would be a bit easier for beginners, and won't be too hard to learn that it's just "for i in range(n)". It was also easier to implement, and you can at least use while loop for everything for can do.
The only thing we're actually using the built-in gdscript interpreter for in terms of the execution is the interpretation of individual expressions, so we had to implement all the flow control ourselves. We could have maybe just inserted the code into a full script to execute that. However, this wouldn't have allowed us to show the code executing like we did.
Thanks again for the feedback and playing the game!