Here is OverBorder Studio’s message on the delay:

After listening to the community feedback from the recent Steam demo, we’ve made the difficult decision to push the launch date for Thymesia back by a few days to August 18. We are 100 percent committed to making Thymesia the best experience possible, and those few extra days allow us to do this by implementing changes and fixes that were asked for across all platforms.

We appreciate all the support and love you’ve shown Thymesia so far, and we can’t wait for you to jump in as Corvus next month!