From 2002-2003, Sam Steele & I created a Dreamcast game from scratch. Sam did most of the programming, and I did pretty much everything else (even if I sucked at it), including Music, Graphics, Textures, Level design, ideas for new game mechanics, etc. Composing music was one of the things I really loved doing back then, and I wrote a ton of music for DCBlap (but, boy did it suck : )
DCBlap ended up becoming one of the most popular Dreamcast Homebrew games ever released. We created a ton of content, including a Breakout-inspired version of the game (Blap-out), Multiplayer, “Themed” releases (Hare Tokidoki Buta & King of the Hill, others).
This was my first experience creating something people wanted, and I've been chasing the thrill of it ever since.