Handmade Hero – A complete game live-coded from scratch
If you like HMH, I encourage you to also check out Ferris Makes Demos and Ferris Makes Emulatorshttps://www.twitch.tv/ferrisstreamsstuff
https://www.youtube.com/channel/UC4mpLlHn0FOekNg05yCnkzQIt's a mix of livestream development and democoding (mostly Rust and C++) and super-detailed breakdowns of demos and tools he's built. He does a super good job of taking effects and tools that seem very intimidating and breaking them down into understandable parts.