Here's a visualization showing the communication between the GB and SNES of this custom SGB driver. Later in this video, it shows a slowed down preview with a Mesen Lua script visualizing of how the GB-produced buffers are being synchronized to the SNES.

Here's a Super Game Boy enhancement driver I need to finish some day. It uses a circular buffer in VRAM to communicate with the SNES at 60fps via a combination of command data and per-frame data, rather than joypad packets. This particular version allowed a Game Boy game to reuse Game Boy Color art.

I prototyped a shmup in Picotron at one point. I was still trying to come up with enemies. To test, I randomized wave arrangements until I did stage design. It was fun to put together some of the HUD and animation effects in this. I had plans for a 3x3 "powerup grid" with mix-and-match equipment.

here's a top-down 3D thing I was making earlier this year. I made a game-engine on top of Zig and SDL. Among other stuff, it supported batched triangle meshes, billboard sprites, rich-formatted pixel fonts, render targets+shaders, keyboard/gamepad input+custom binding, cross-platform desktop builds.