i keep being tempted to make something kinda like Pico-8, but instead of one set of limitations, you instead have a bunch of components you put together into your OWN fake device, each with their own quirks and limitations.
So perhaps your display is made up of 6 lines, rather than pixels, running from the left to the right, and you control them by defining a set of points they pass through. Maybe it's a standard display, but your display chip has oddities. Maybe your processor is made up of nodes, like the TIS-100, or runs on EXAs, or something like that. Depending on the components, making a game might be easy or crazy hard, but they all provide interesting things to work *with* and *around*.
This is what I want from stuff like Pico-8... Not "looks like it's old hardware, just running slightly modified Lua under the hood" but "looks like it's on old/weird hardware, funky shit going on under the hood like old hardware"