The Amazon Fire TV and Fire Stick have simple remotes and their applications can be little more than web applications.

An example of the remote: https://developer.amazon.com/docs/fire-tv/remote-input.html (also includes relevant docs for Fire TV.)

Using the Internet browser within my Fire Stick "works" for PICO-8, but appears to use a touch screen interface. I am forced to use my remote to drive around a virtual finger to either use directional buttons or press the fire/jump buttons. This isn't a functional interface when using a remote.

Personally, I'd be willing to pay money to get Splore as an app on my Fire stick instead of having to deal with the web interface at all. The remote should work really well for these games, and it would be great to play them on my projector.