You specifically used morse code to circumvent the limitation… yet there is still text in the title screen, and letters in the morse code sheet in the gameplay. You achieved nothing! 😂
That aside, it is actually a fun way to educate people about morse code. The art and submarines are really cute too, which adds a nice touch. The key input seems a bit unresponsive; if not mistaken, you basically stop detecting inputs for a while if the player keys in the wrong letter, correct? If so, there needs to be an indicator of how long before the player can input again.
Overall, I enjoyed playing it and it’s a nice educational game. Keep it up!