I love the retro-ness of this!!!!!!!!
The art is awesome! The whole visual and colours of the game are very cool! It has its own unique style! (dark orange tones are a win!).
The Morse code makes it really different and makes you really pay attention to what you're doing which adds a nice dynamic to the game, I thought the sounds were really good for that too.
The levels increased in difficulty at a really good pace as well!
Overall a very cool game! Nice work! :D