Many of the games and experiences you may have played with in Decker are structured like choose-your-own adventure stories, navigating through worlds a screen at a time. Keyboard input has some limitations- in the interest of making decks usable on multitouch devices- but it's still possible to make turn-based puzzle games. Here's a little Sokoban clone as an example:
There are only two simple puzzles to solve, but if you complete them you can unlock the deck and poke around inside, and perhaps try your hand at drawing a few more levels. Please let me know if you'd like to see a writeup explaining how this works!
This rocks, thank you IJ.