Camera size is relative to your resolution. It shows the exact number of pixels the sprites in the scene are set in, which allows to easily move the camera in intervals that are made of whole screen pixels only, not fractions. And thiss is the only clean way that I know of to remove the artifacts that appear on 2D sprites when camera is moving. The downside of tis technique is that your resolution actually dictates how much of the game area you can see. This is bad of course, there need to be several settings for the camera size depending on your resolution, but I didn't have time to think about that during the jam. As with lots of other things apparently )))
-- POSSIBLE SPOILER --
The four buttons puzzle is a 'repeat the sequence' puzzle. But with a twist - since the game is lying to you, in each sequence you need to push the buttons it highlights in reverse order.