Port of the mobile version is now available for $14.99
Seemingly out of the blue, Square Enix dropped a PC version of Chrono Trigger on Steam today. The RPG classic—which includes higher-res graphics, updated sound and controls, and an auto-save feature on the map—can be purchased for $14.99.
For what it's worth, I would be remiss to note that this appears to be a straight port of the mobile version. Square Enix doesn't have the best track record with the presentation of these versions, so check it out at your own risk. (Or track down the excellent Nintendo DS version.)