Y'all did a great job of coming up with this mechanic and cleanly implementing it in such a short amount of time. The first level feels like a pretty big leap for the player to make, but totally within the scope of the project. Perhaps I'm just bad at this, but once I figured out how to do a T, the rest of the game really clicked. Maybe adding one more complex letter to the tutorial might help unlock brains?
Looks really nice. Good job :)