well, using kanon 2006 is a bad example.
since its a second attempt at turning the series into an anime and all...
being a die hard kanon fan there, orion, shows some bias
I'm a huge to heart 2 and wind a breath of heart fan. but I'm not going to lie to you. the TV series were a C-, shuffle memories which was a blatant cash in was a D-, so releasing any type of 'Game' adaptation anime is always an uphill battle.