Nice game! I really like the concept of protecting the player. The abilities were cool, especially the trees surrounding the enemies! I hope you will keep learning and building up your idea, great work!
When it comes to learning Godot, the only real tip I can give you is to just keep making games! I know it's not the best sounding tip, but there is no "watch this video and you will be a godot master". Make pong, snake, super mario, tic tac toe, flappy bird. It's good to remake games that already exist because you don't have to design the game, you already know what the game will look like so you can just focus on developing! Good luck learning, and have fun!