Thanks for the feedback! Lack of time pressure and fluid crank controls were key aspects of transmewting's design, so it's great to hear you enjoyed them!
A "square group" is a group of 4 blocks of the same type (catnip or fish paste) arranged in a square. Blocks will remain in the room until they are in a square group and connected to a bolt.
Be sure to download the 2.0 update, one of the new features is a demo on the title screen that demonstrates various ways to combine bolts and square groups together!
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Thanks, I think I understand now! I didn't grasp "square groups" (not even in the 2.0 demo animation) because the groups that highlight aren't 2x2, they are groups of 5 squares. If that's confusing to people, maybe they could be referred to as "2x2 groups" instead of "square groups" or something. (And/or the actual 2x2 square could be highlighted differently from the bolt when you match, so visually there is a 2x2 group to see.)