Loved it, but I stopped at level 6 (was it 6?), because the amount of backtracking seemed excessive. (first traverse the whole level to drop a stone, then backtrack to the beginning and do some other part to get the pickaxe, then return all the way to the bridge to destroy one of the the two stones there)
The game definitely was at its strongest when the maps were on the smaller side.
Sometimes I morsed different letters- making me wonder what kind of neat commands they could entail. Also, I accidentally morsed 'R'etry a few times- I had a good laugh :D