Spelunky
spelunkyworld.com
Roguelike cave-exploring platformer with procedurally generated levels; free original in 2008, HD remake in 2012.

Underwater exploration action-adventure co-created with Alec Holowka as Bit Blot.
Visit Aquaria ↗Underwater exploration action-adventure co-created with Alec Holowka as Bit Blot. Aquaria is a indie game makers product built by indie maker Derek Yu, launched in 2007.
spelunkyworld.com
Roguelike cave-exploring platformer with procedurally generated levels; free original in 2008, HD remake in 2012.
mossmouth.com
Sequel to Spelunky set on the Moon, with deeper systems and online multiplayer.
50games.fun
Collection of 50 original single and multiplayer games styled as the library of a fictional 8-bit console maker.
en.wikipedia.org
Freeware Metroidvania-style action game he co-designed and illustrated.
tigsource.com
Long-running indie game blog and forum community that he founded and maintains.
Aquaria is a indie game makers product: Underwater exploration action-adventure co-created with Alec Holowka as Bit Blot.
Aquaria was made by Derek Yu, Indie game designer behind Spelunky, Spelunky 2 and UFO 50, founder of Mossmouth. It launched in 2007. Derek Yu has also built Spelunky, Spelunky 2, UFO 50, Eternal Daughter.
Yes. As far as IndieMakerList knows, Aquaria is still active and run by Derek Yu at bit-blot.com.
vibejam.com
Game jam for games built mostly with AI coding tools.
fly.pieter.com
Multiplayer browser flight simulator built largely with AI prompting that went viral.
Co-founded company that built programming games (like Stockfighter) to identify talented engineers for hiring; shut down in 2016.
survive10waves.com
A small browser game experiment.
apps.apple.com
Casual game built around a viral TikTok trend.
apps.apple.com
Game that teaches you to play piano notes.