Bedrock is a lightweight program runtime: programs assemble down to a few kilobytes of bytecode that can run on any computer, console, or handheld. The runtime is tiny, it can be implemented from scratch in a few hours, and the I/O devices for accessing the keyboard, screen, networking, etc. can be added on as needed.
I designed Bedrock to make it easier to maintain programs as a solo developer. It's deeply inspired by Uxn and PICO-8, but it makes significant departures from Uxn to provide more capabilities to programs and to be easier to implement.
Let me know if you try it out or have any questions.
I hope you stick with this!
I've got plans for tooling in the future that will make Bedrock more accessible to people who are learning to program, like a high-level language that runs on Bedrock and a graphical debugger for visually clicking around and changing the internal state as your program runs.