Thank you for the insightful comment. It got me thinking, by only doing this project I can only learn about 2D games, 2D art and some storytelling. But nothing about 3D games.
Therefore, starting from the next month, I will start working on a 3D game as well.
As for this game, Fteria, I will be adding a new witch boss fight and some story every 2 months. I have a specific ending for the story, but for the boss fights, I could make those indefinitely.