The idea is not bad: using Morse code in the menu and for spells to defeat the enemy, combining this with a game of rock–paper–scissors is quite original.

I want to make one remark: when changing the size of the game window, a gray area appears. To fix this in Godot, you need to go to the project settings, go to Display/Window and change the Mode parameter to canvas_item or viewport (depends on the style of the project, try both and decide which one suits your project better), and also change the Aspect parameter for yourself (you can also experiment).

Good luck in further mastering the Godot Engine!

Very interesting idea, especially for a first game. I definitely wasn't expecting a game about morse code! If you had some more stuff and features and sound effects, this has potential to be a super cool and unique game :)