Heya!
I don't know if this was necessarily what you were looking for, but you can use the search system on itch.io to narrow down search results to Escape Games that are browser based and can be played without download: https://itch.io/games/platform-web/tag-escape-game
You can also search for platform games that can be launched via browser too: https://itch.io/games/genre-platformer/platform-web
Hopefully that helps in your search for more browser based games!