itch.io has regular browser games here: https://itch.io/games/platform-web

itch.io also has PICO-8 games that can be played in the browser here: https://itch.io/games/tag-pico-8

Many of the top PICO-8 games are de-makes of popular titles, so that might help. Here’s a list for de-makes: https://github.com/pixelbath/pico8demakes.

Celeste seems like your best option, but there are a handful of games with the “Narrative” tag here: https://itch.io/games/tag-narrative/tag-pico-8

Does Wii U with its entire eShop count as a retro console? Because, despite being unpopular, it had a lot of games from a lot of past Nintendo consoles.

My understanding is that GoG does some work to make sure that old games they sell will work on new PCs. I have at least one game that is bugged on Steam, but works fine from GoG.

I’ve really enjoyed having Firefox and Ublock on my phone. It’s so nice :) I’m hoping for augmented Steam and Unpinterested extensions to get added too.