Hollow Knight

Three people at Team Cherry in Adelaide, Australia made a hand-drawn Metroidvania with 50+ hours of content and sold it for $15. The game has over 3 million copies sold, a 90+ Metacritic score, and is widely considered one of the greatest platformers ever made. The art style, boss design, and Christoper Larkin's orchestral soundtrack rival anything from studios 100 times their size. The sequel Silksong has been in development since 2019, generating a level of anticipation that has literally spawned its own meme culture around the wait.