Seems funAs I mentioned before, I am a fan of old PC games made by the company Hamumu. This game is called Loonyland 2 collectors edition.
I actually just finished the game. The final boss turned out to be a two dimensional being called the happy stick bird. It was just an m shaped line.
For reference, happy stick is a recurring theme in these games made by this company. They are all two dimensional beings that look like stick figures. However, they are very powerful. If I recall correctly, there is a happy stick man, the happy stick spider, the happy stick witch, the happy stick bird, and the happy stick boy.
These games are my childhood.