Indie Adventure games
Indie Adventure games are story-based and rely on exploration and puzzle solving to get you through the game. Adventure games will take you on mystic, exotic or some other fictional adventure in fantastic environments.
Indie Adventure games deliver a bit smaller but more unique experience, and playing only mainstream games will make you lose a lot of different gaming fun and exciting experience that Indie games can provide. Not having a publisher to restrict creativity Indie games can give you way more exceptional adventure than the mainstream titles.