As previously announced, the Switch version will feature color readjustments, and the ability to scroll up and down event CG since the screen ratio is 16:9. Characters are fully voiced, aside from the protagonist, who is only partly voiced.
Kanon first launched for PC on June 4, 1999 in Japan, followed by Dreamcast on September 14, 2000, PlayStation 2 on February 28, 2002, PSP on February 15, 2007, feature phones in May 2007, Android on November 30, 2011, and iOS on April 4, 2013. An official English version was never released.
Here is the story synopsis, via VNDB:
Yuuichi Aizawa, a high school student, returns to a town that he last visited 7 years previously to live with his aunt and cousin. For a reason he’s not quite sure of, he can hardly remember anything about his last visit, but initially this doesn’t seem to worry him too much.
The day after he arrives he goes into town where he (literally) bumps into a girl named Ayu Tsukimiya, and Yuuichi’s memories slowly begin to return.