Really satisfying game, visuals are simple but clear and really add to the overall aesthetic. The sounds of the keys clacking sound are really good. Just a bit of feedback: 

• Would feel better to be able to repeat commands by pressing the up arrow like on terminal/ command prompt.
• The fail sound is really unpleasant. I reckon it could be a lot quieter. 
• Levels are engaging and UI communicates each element really well.
• Would like to have a text reminder for each level, telling the player to type help to remember the commands. 

Overall really good game!