I really liked this game! Really well made, polished, and the idea is great and well executed too. I mean it! The way the levels are constructed makes the game a lot easier to understand as well. The way the game blends in the page is quite nice too! I also really liked how the game doesn't mention "clear" as a command, but it works fine when clearing the text.
If you don't mind me giving some more feedback, I think allowing the player to press the up arrow key to retype the last command and the tab key to autocomplete a command (just as in Window's cmd and in Linux terminals) would be amazing (it would help a lot at some levels, such as 7_hex, since for some people typing fast is kinda hard).
I would also suggest using the AudioStreamPlayer node instead of the AudioStreamPlayer2D node for the typing sounds. For headphone users, the latter one makes the typing sounds come from the left earbud mostly. I would suggest making the screen distortion a bit weaker. It's fine as it is now, but making it a bit subtler would be nice in my opinion.
I'm don't think my opinion on this really means anything, but I think this game even has potential to have a bigger release. I'm not sure about this though, I don't have as much experience as you hahaha
Edit: Fixed a capital letter after a comma.