There are plenty of alternatives you could find on [1] in the context of fantasy console, almost all of them, oss or proprietary, active or dormant. And honestly many of them were inspired by PICO-8.

Disclaimer: I'm one of the contributors of the list of [2].

[1]: https://github.com/paladin-t/fantasy

[2]: https://github.com/pico-8/awesome-PICO-8