You'll get Frozen Synapse no matter how much you pay, but pay more than the average, even by just one cent, and you'll get the Frozenbyte Bundle as well. It includes DRM free versions of Trine, Shadowgrounds, Shadowgrounds: Survivor, and early versions of Splot and Jack Claws. Splot will be updated when it is finished, and Jack Claws is dead. You'll be able to register these games in Steam, as well.