Hi guys, I just discoved a website called indiexpo. It has a nice area called Console. Downloading the indiepad app (still only for android) you will turn your smartphone in a gamepad and can play your pico-8 game using the PC like monitor.
The nice thing is that it's very easy and fast upload a game there and enable the "indiepad feature".
No plugin, no code, no script. When you're creating your page, you have to check "indiepad" and select the keys used in your game.
Very easy and fast.
I already played several games made with pico-8 on it (Find Gold and Kelin). They works very good.
They want to create also an app for Chromecast to play the games there.