The "free time" game

I know you're asking yourself "Why this weird nickname? Well, if you don't know this, you probably don't know the history of this amazing game... Let me fix this issue for you 😁

The history of Cave Story

Cave Story is a 2004 Metroidvania game for Microsoft Windows, developed over five years of work by Japanese independent developer Daisuke "Pixel" Amaya in his free time (this is why I called it the "free time" game), and published on 20th December 2004. It features 2D platform mechanics and is reminiscent of the games Amaya played in his youth, such as Metroid and Castlevania. This was the first indie game to gain worldwide success, and paved the way to the affirmation of the "indie" game genre.

You can download the game from the Official Tribute Site