I enjoyed this game a lot.
The presentation and the overall quality and polish to it is quite impressive for a 48 hours game jam, to say the least.
I have a small complaint about the letter "T"; it was very troublesome to figure out. First, I imagined that it would be an "L" that is flipped vertically combined with an "L" that is flipped vertically and then horizontally, but that was not it. Then I thought, maybe it's the vertically flipped "L" and a rotated "I" to complete that missing "T" shape also with no luck. When I finally found out the solution, I was rather disappointed, as it wasn't consistent with the way that the game has trained me to imagine the combination of the different letter shapes. The same issue with the "S" letter.
I would suggest that any given letter would have multiple solutions to not confuse or disappoint the player or make them feel stupid.