It has been brought to our attention that a number of users are having an issue where the final boss's stage is sending them back to the world selection screen instead of starting the battle. We are aware of the issue, and we will be trying to fix this along with an error where some mac users are not able to launch the game within the next 24 hours. Thank you to those who posted about this, and we hope you will enjoy the finale to the game once this is fixed.
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.