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Unsure about the shake to move. However, tilt seems to be very much a thing as evidenced by this Kirby's Tilt n' Tumble-like game the official Playdate twitter shared: https://twitter.com/playdate/status/1293636192022364160

Thank you! 

Ah, and about the polygraph mechanic and polygraphs in general. The jitters are actually controlled by the player. I failed in communicating that if you press [space] when the heart's timer reaches [0] the jitters would be placated leading to a more "calm" reading. As such, any jitters would be a result of the player becoming unnerved and mistiming the [space] input. There are no actual branches in story as a result of the polygraph, which keeps players who interact with the mechanic and players who don't on relatively the same track.

Polygraphs are of course, easy to give a false reading. They only accept input and display the results putting responsibility for any actual analysis on the practitioner. If you have the time, try playing Polygraph again with this new information. It's quite a challenge to read the text while simultaneously keeping an eye on the timer!

It was an interesting idea but it wasn't very fun to play. As complexity increased it felt less like solving a puzzle and more like trial and error with the tools provided. There is also a lot of waiting the player has to do in between each try which only stifles the fun. I am reminded of Lemmings and Mario vs Donkey Kong. I also encountered a (bug?) issue in which a loop would have a chance to fail if you were relying on precise timing.