If you're not sure what the game is all about, there are plenty of write-ups that you should read first. After the public playtest, we listened to Chris Hecker talk for the better part of an hour. Here's my write-up / notes from the talk:
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First Chris Hecker apologized a lot for being unprepared and stuff. Then he started talking. (Pretty much everything here is paraphrase.)
Most games have you constantly moving. In Counter-Strike, for example, you're constantly adjusting your trajectory, your view angle, etc... but in Spy Party, constantly moving / fidgeting means death. The idea here is that video games should also be about performance; sometimes your playthrough is just "good enough" and you live with your mistakes, you improvise. The key to being a Spy is moving with confidence; be Zen. (Though NPCs also randomly fidget too, just to fuck with the sniper.)
But right now, there's a big problem with Spy Party -- a master Spy cannot perform a mission if a merely decent Sniper is watching. Ideally, a master Spy should wipe the floor with a decent Sniper, regardless, but that isn't the case. Once the Sniper learns a few heuristics, the game goes from heavily favoring the Spy to heavily favoring the Sniper.