Wrong moves count it too rigid / unecessary
(from Kalani by email)
The penalty for a "wrong move" while a single logical move is still in progress. For example, my son dragged an "a" below "a*x" (logically, he multiplied by "1/a") and while he was trying to drag the "a" below groups on the other side of the equation, the app registered a wrong drop (as if he was trying to add the "a" to some other value). This move then counted against him and he was very upset. It seems like an unnecessary penalty, possibly it's worth having a "strictness" option if you feel strongly about keeping it in.
As undo now undo moves, this issue is closed.
Now that undo can undo moves (in 1.1 to be released soon), this should be less of a problem.
Feel free to comment if you feel otherwise!