Morse Code Farm Defense Lite

You are managing a farming field where you cultivate Morse code. It is a quiet and easy life. However, one day aliens appear from nowhere and start to bombard our fields and vehicles (plowers, seeders, and harvesters). Our scientists have developed advanced missile systems with current Morse code you can guide the missiles to track down alien UFOs. Please protect our fields and vehicles at all cost! Good luck!
The full version is in https://itunes.apple.com/app/morse-code-farm-defense/id1169436500?ls=1&mt=8