There's no reason you couldn't do this. It would really only be marginal more complicated than programming a normal game I think. Designing levels that make good use of it would be hard though.
It's named after the Sherlock Holmes stories which were written by Arthur Conan Doyle and feature John Watson as a narrator. So Watsonian is the in-universe one and Doylist is the out-of-universe one.
voxpoplar wrote
Reply to Does this idea make sense? 2 time dimensions in video games by twovests
There's no reason you couldn't do this. It would really only be marginal more complicated than programming a normal game I think. Designing levels that make good use of it would be hard though.