I've been vibe coding a game on the side.

It really makes me appreciate how important good game design is. Claude is doing a fine job coding everything I describe, but it doesn't really understand fun, so I need to.

(It's not a great game)

This is my experience too. I think people with no gamedev experience widely underestimate the challenge of good game design and the need for iteration with real people testing the game. In a similar way that an inexperienced game developer overestimates their skill to assess the fun and all the small details that matter, and will get demolished when it's first playtested by other people.