itch.io

Games I find that work on mobile browsers. Usually this involves:

• Touch input support
• Window resizing to fit screen

Games in this list may not work perfectly but they are playable. Tested on iOS Safari. 
Also check out these tags where most games are mobile friendly:

• https://itch.io/games/made-with-pico-8
• https://itch.io/games/tag-bitsy
• https://itch.io/games/html5/platform-ios