The sweet feeling of defeating a boss after almost 5 tries when the boss actually had 10% HP left but you died and finally you beat him in the end and each round is almost 15 minutes long and reaching the destination is almost 5 minutes long: Priceless... Terraria is stealing my life away... XD
You know, I sometimes ponder if working on the story and details is more necessary than the game itself. Its... technically work, just not direct.
Like for me specifically I never stop evolving the story based on what avenues I can approach in gameplay and then I get anxious thinking "hey good thing I thought about that now instead of later". Repeat ad nauseam.